You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I need to change my reservation as my get together program got postponed. Can you help me?

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

USER: I am Nicholas Allen.

ASSISTANT: Sorry, there are no reservations found.

USER: Ok fine, thanks for checking.

ASSISTANT: Thank you for reaching us.