Fix conversation id in HangupPhoneCallFn

[hchen2020]

No description provided.

[GGHansome]

Auto Review Result:

Category	Issue Description	Suggested Improvement	Code Example
Naming Conventions	The variable routing has been renamed to convService. While the new name is slightly more descriptive, it should match the service name.	Rename convService to conversationService to improve clarity.	var conversationService = _services.GetRequiredService<IConversationService>();
Dependency Injection	Directly fetching dependencies using _services.GetRequiredService<> makes unit testing harder as dependencies are not passed in via constructor.	Refactor to use constructor injection for the services required by the class.	public HangupPhoneCallFn(IFileStorageService fileStorage, IConversationService conversationService, ...) { ... }
Code Readability	The inline variable convService is localized within a single method, which is acceptable, but consistency in naming is key.	Ensure all variable names clearly convey their purpose for better readability.	N/A
Single Responsibility Principle	The method Execute is directly responsible for obtaining multiple services, which might indicate it is handling too many responsibilities.	Consider decomposing Execute into smaller methods to adhere to SRP.	void Execute() { GetConversationId(); GetTwilioCallSid(); }
Null Checks	There is no indication of null checks for services fetched from _services, which might result in exceptions if services aren't registered.	Add null checks or better, ensure registration of all services is validated at application start.	var conversationId = convService?.ConversationId;

Summary

Overall, the changes improve the service used, but there are opportunities to enhance naming conventions, streamline dependency management through DI principles, and improve maintainability by adhering to the SRP.