You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you now?

USER: I want to change my reservation due to sudden postponement of my trip, can you please help me out with that?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Thank you for accepting my request, I have reserved it on the name of Kenneth Taylor.

ASSISTANT: Ok, Please allow me a moment to check for the previous reservation in our database.

USER: Sure, take your time.

ASSISTANT: Thanks for remaining so positive, we are sorry to inform you that there is no active reservation found on your name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for checking.

ASSISTANT: Thanks for reaching us, wish you a great day.