You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my reservation, due to some health problems I am unable to travel those dates, can you please cancel my reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Raymond Allen.

ASSISTANT: Sorry to inform that there is no reservation found with your name previously.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for reaching us.

USER:  Thank you for your information.