You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Williams.

ASSISTANT: How can I help you at this moment?

USER: In the last month I have reserved a flight on my name to travel to Seattle to celebrate my brother's birthday but suddenly there is an examination on the same date our college management has informed us suddenly. 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 will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your previous reservation status.

USER: Sure, I can wait for your response.

ASSISTANT: There is no previous reservation found under your name.

USER: Ok, that's fine. I can check it later. Thank you for your service in checking.

ASSISTANT: Thank you for contacting us, have a good day.