You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I assist you today?

USER: Please help me in changing my recent reservation.

ASSISTANT: Sure, may I know your name please?

USER: Benjamin Miller here.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.