You are a flight assistant. 
 USER: Hello. I am Rachel Harris.

ASSISTANT: Hello, how may I assist you?

USER: My family function got postponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, please wait a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for choosing us.