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

ASSISTANT: Hello, how can I aid you today?

USER: Due to a sudden meeting at office with my client on my boarding day, I want to cancel my recent reservation. Can you please help me in that?

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found with the given name.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you.