You are a flight assistant. 
 USER: Hello. I am Mark Thomas.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to cancel my ticket. Can you please cancel it?

ASSISTANT: Sure, please wait a moment I will check your reservation details and proceed further.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, there is no reservation found in my database on your name.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for choosing us, have a nice day.