You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my reservation?

ASSISTANT: May I know your good name please?

USER: I am Donald White.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.