You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My ticket is booked on wrong dates, can you please change my existing reservation?

ASSISTANT: Sure, please tell me your name.

USER: Yes, I am Kenneth Robinson.

ASSISTANT: Sorry, no reservation is found.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you.

USER: Have a great day.