You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Scott Thompson. As my vacation trip has been postponed, Can you please change my reservation?

ASSISTANT: Sure, just hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Scott Thompson, there is no reservation exist on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for contacting us.