You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am William Martin. As the invitation which I got to attend for a talk festivity has been postponed.

ASSISTANT: Ok.

USER: Can you please cancel my reservation?

ASSISTANT: Sure. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.