You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my reservation as I have private work in my own city. Help me in changing my reservation.

ASSISTANT: Ok, let me know your name to change the reservation.

USER: I am Margaret Clark.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation.

USER: No issue, thank you for your assistance.

ASSISTANT: Thanks for approaching us.