You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Kevin Jones and I want to change my reservation. Can you please help me ?

ASSISTANT: Please wait a while.

USER: Please take your time.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.