You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My daughter is giving a presentation on international competition, but due to some sudden changes, I want to change my existing reservation. Can you help in that?

ASSISTANT: Ok. May I know your name please?

USER: My self Betty Roberts.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Thank you for your hand help in searching my booking.

ASSISTANT: Thank you for contacting us.

USER: Thank you.