You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, we are perky to help you.

USER: Thank you for accepting my request.

ASSISTANT: Can you share your good name?

USER: I had reserved it on the name of Jack Green.

ASSISTANT: Please be on hold.

USER: Sure, take your time.

ASSISTANT: Thanks you for your time, there is no reservation found on your name in our database to change it.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you.