You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am a police officer and there is a meeting which is going to be held at Washington but suddenly there is an issues which is going in my home town Charlotte, so I have to change my ticket reservation. Can you please help me in changing my flight ticket booking which I have done under my name Ruth Thomas?

ASSISTANT: Sure, I will help you with the change of flight reservation. May I know your name please?

USER: Thank you for accepting my request, I have done my reservation under my name Ruth Thomas.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: But I am sorry to say that there is no flight reservation on your name to change it.

USER: It's ok, anyway thank you for the information.

ASSISTANT: Thank you.