You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: In the last month I have reserved a flight ticket on my name to travel to San Francisco to celebrate my father birthday but suddenly there is an examination on the same date and our college management has informed suddenly to us. So I am unable to travel the trip which I was planned. Can you please help me in cancelling my flight ticket?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation?

USER: My name is Melissa Walker.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation on your name in our records.

USER: No problem with that one, I can rebook the ticket. Thank you for your information.

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