You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is David Davis, I want to cancel my reservation due to my bad health. Can you help me with cancellation?

ASSISTANT: Sure David Davis, I am here to help you for this. Let me check your reservation in our records?

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: David Davis, I found your reservation and cancelled successfully.

USER: Thank you for your service.

ASSISTANT: Thank you very much for contacting our agency.