You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carol Williams.

ASSISTANT: I am here to assist you with your concerns.

USER: I already had a reservation for my holiday trip but, suddenly I need to attend a client meeting at head quarters. So I need to change my reservation. Can you please help me with that?

ASSISTANT: Ok, I will assist you with that. Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no flight ticket been reserved on your name as per your database.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing our agency.

USER: Thank you for your information.