You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My business meeting has been postponed, so I would like to change my existing reservation.

ASSISTANT: Sure, I will hep you. Can you please tell me your name?

USER: Sure, my name is Joseph Johnson.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation with your name to change further.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for approaching us.