You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are expecting from us?

USER: I have to do some modification in my previous flight ticket booking that there is a sudden event held in my hometown, so I am unable to travel the trip. can you please help me out with changing my reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Not a big problem, anyway, thank you for your kind information.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your service.

ASSISTANT: Can I know your name?

USER: Sure, myself Christopher Wright.

ASSISTANT: Thank you.

USER: Most welcome.