You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Brenda Brown. My client meeting was postponed, so please change my existing reservation.

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, no reservation found with your name.

USER: Not an issue, thank you for your help.

ASSISTANT: Thank you for approaching us.