You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you now?

USER: Could you please help me with changing my existing reservation due to postpone of my event?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: I am Sarah Johnson.

ASSISTANT: Please wait for a moment, while I check for your reservation.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, we hope see you again.