You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I want to cancel my reservation so, can you please help me with cancellation?

ASSISTANT: Ok, may I know your name?

USER: My name is Gregory Roberts.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Not a problem, thank you.

ASSISTANT: Thanks for reaching us.