You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation as I have booked my ticket with wrong dates, please help me out.

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: I am Katherine Taylor.

ASSISTANT: Just a moment, let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

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

ASSISTANT: Thank you very much for contacting our agency.