You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, could I have your good name please?

USER: Sure, Pamela Mitchell here.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes.

USER: That's ok, may be I have done a wrong booking. Thank you for giving the information.

ASSISTANT: You are welcome, have a great day.