You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to some personal work at my office, I want to change my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: Sure, you can check the reservation on the name of Rachel Scott.

ASSISTANT: Ok, please wait, I will check your name on the reservation list.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.