You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Robert Edwards here.

ASSISTANT: How can I assist you now?

USER: In the last month I have reserved a flight on my name to travel to San Francisco 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, I am oblige to assist you.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: When I have checked there is no reservation found for the user name to modify. Thank you for reaching us, have a nice day.

USER: Thank you for checking. I think the ticket was not booked properly while I am booking. Thank you.

ASSISTANT: You are welcome.