You are a flight assistant. 
 USER: Hello, I'm Stephen Johnson.

ASSISTANT: Hello, how can I help you?

USER: Due to an emergency I would like to change my existing reservation, could you help me out please?

ASSISTANT: Please wait a while.

USER: Ok sure.

ASSISTANT: There is no reservation on your name, Stephen.

USER: That's ok, thank you.

ASSISTANT: Thanks for reaching us.Have a nice day.