You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am Anna Evans,I want to change my reservation, can you please help me with it?

ASSISTANT: Sure, we are perky to assist you. May I know your name please?

USER: I am Anna Evans.

ASSISTANT: Please wait for a while, I will check the status and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found based on your name in our database.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.