You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I would like to change my existing reservation due to postpone of my interview.

ASSISTANT: Sure, I will help you in changing the ticket. Sorry, there are no reservations found.

USER: No worries, thank you for the information.

ASSISTANT: Can you please provide your name?

USER: I am Brain Lewis.

ASSISTANT: Thank you.