You are a flight assistant. 
 USER: Hi,. I am Carolyn Johnson.

ASSISTANT: Hello, what kind of service you are expecting from us?

USER: I need to change my existing reservation as my meeting with share holders has been postponed. Could you help me out in changing my reservation?

ASSISTANT: Sure, please wait I will check your name in our database.

USER: Sure.

ASSISTANT: Thanks for your time, no rservation was found on your name.

USER: Ok,. Thank you for sharing the information.

ASSISTANT: Thank you for serving you.