You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Shirley Turner. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We did not find any reservation on your given name in our data.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.