You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Actually, I accidentally book my flight with wrong dates. Can you change my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: Paul Parker here.

ASSISTANT: Sorry Parker, there is no reservation on your name.

USER: Oh!. It's absolutely fine. Thank you for your time.

ASSISTANT: Do you want any other information?

USER: No.

ASSISTANT: OK, thank you. Have a great day.