You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Sure, I am Katherine Roberts.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Katherine Roberts, there is no active reservation found under your name to do changes in that.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.