You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please help me in changing my recent reservation?

ASSISTANT: May I know your name please?

USER: I am Carol Nelson.

ASSISTANT: Please wait a while.

USER: Ok.

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

USER: No worries, thank you for your information.

ASSISTANT: Thank you for opting us.