You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Due to urgent work, I would like to change my reservation to some other date, can you please help me out with that?

ASSISTANT: Sure, I will help you. Please provide the name on which ticket was reserved.

USER: Thank you for taking my request into consideration, my name is Frank Turner.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: You are welcome, have a nice day.