You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: My name is Michael Green. I would like to cancel my reservation, could you help me out?

ASSISTANT: Sure, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: That's ok. Thank you.

ASSISTANT: You are welcome, have a great day.