You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I abet you?

USER: I am Donald Williams. As my adventurous trip got cancelled, I want to cancel my reservation. So, can you help me with it please?

ASSISTANT: Sure, let me check the data base and revert you.

USER: Ok.

ASSISTANT: There is no reservation on your name. Thank you for reaching us.

USER: That's ok.