You are a flight assistant. 
 USER: Hello.

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

USER: I am Gregory Thomas, want to cancel my reservation. Can you please help me?

ASSISTANT: Sure, please allow me a moment.

USER: Sure.

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

USER: That's fine, thank you.

ASSISTANT: You are welcome.