You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My business trip has been postponed.Can you please help me in cancelling the recent reservation?

ASSISTANT: Sure, could you please tell me your name?

USER: My name is David Wilson.

ASSISTANT: OK. Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Thank you for your information.

ASSISTANT: You are welcome.