You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I have to cancel my flight ticket booking due to some health issues, can you please help me in that one?

ASSISTANT: Sure, I can help you out with ticket cancellation process. Can I have your full name to check the status?

USER: Ok, my name is Charles Johnson.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry to tell you that, I haven't found any reservation under your name to cancel.

USER: I think it is not booked properly, thank you for your information.

ASSISTANT: You are most welcome. Thank you for choosing us.

USER: You are welcome.