You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Laura Campbell. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Ok Laura Campbell, please wait for a while I will revert you back with the proper information.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name to change it.

USER: That's ok, no problem.

ASSISTANT: Thanks for consulting us.

USER: Thank you.