You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. I hope you are good today, how can I assist you?

USER: I am Jack Miller. This is with reference to my booking with your booking agency last week. I'm sorry to inform you that I won't be able to complete my trip due to my exams has arrived, hence I would like to change my booking to other dates. Can you please help me out with my query?

ASSISTANT: Sure, I will help you Jack. Please wait a while.

USER: Thank you for helping me in changing my request, I will wait for your response.

ASSISTANT: Ok. There is no previous reservation on your name in our database.

USER: Ok, fine thank you for checking my reservation in your database.

ASSISTANT: Do you want to know anything else or do you want to book a ticket now?

USER: No, I don't want to know anything else and I can reserve for a trip after completion of my exams.

ASSISTANT: That's fine, thank you for opting us.

USER: Most welcome.