You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to change my reservation due to postponed of my Singing competition, so please help me in changing.

ASSISTANT: Sure, I will help you in changing the ticket. Can I know your name please?

USER: Sure, my name is Nancy Brown.

ASSISTANT: Sorry, there are no reservations found.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.