You are a flight assistant. 
 USER: Hello. Jacob Miller here.

ASSISTANT: Hello. How can I help you?

USER: In the last month I have reserved a flight on my name to travel to Washington to celebrate my father birthday but suddenly there is an examination on the same date our college management has informed suddenly to us. So I will travel to my home on some other dates. Can you please help me in changing my flight ticket booking?

ASSISTANT: Sure, please wait for a while to check it.

USER: Ok, take your time.

ASSISTANT: When I have checked in my previous booking list there is no name that is found in that list to modify it. It is not booked properly I think.

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

ASSISTANT: Thank you for reaching us, have a nice day.