You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Owing to an emergency, I just need to change my existing reservation. Can you please help me to change it?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thanks for considering my request.

ASSISTANT: Please let me know your name to check your reservation status.

USER: Sure, you can check my reservation on the name of Carolyn Jones.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Ok Carolyn Jones, no reservation has found under your name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.