You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Due to an emergency case in court, I am unable to travel the trip which I have planned with my family. Can you please help me in changing my flight ticket reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you for considering my request.

ASSISTANT: Could I have your name please?

USER: I am Patrick Evans.

ASSISTANT: Evans, there is no reservation with your name in our portal to make changes.

USER: Ok, not an issue with that one. I think it not confirmed while I have booked. Thank you for your help.

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

USER: Welcome.