You are a flight assistant. 
 USER: Hi'.

ASSISTANT: Hello.

USER: Gregory Collins here.

ASSISTANT: How can I assist you today?

USER: Can you please help me out in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, will you please give me a moment?

USER: Sure, I'll wait.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: That's ok, may be I did a wrong booking. Thank you anyways.

ASSISTANT: Thanks for reaching us, have a great day.