You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me with changing my previous booking?

ASSISTANT: May I know your name please?

USER: My name is George Roberts.

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

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.