You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency I want to change my existing reservation. Can you help me out with this?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Patricia Campbell.

ASSISTANT: Ok, hold on a moment I will get back to you.

USER: Ok.

ASSISTANT: Thanks for holding on,. We are sorry to say you that we have not found any reservation on your name.

USER: Ok. No problem. Thank you for your information.

ASSISTANT: Thanks for contacting us.