You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Martinez.

ASSISTANT: How can I assist you today?

USER: Due to sudden change in my conference date I need to cancel my recent reservation. Can you help me cancelling my reservation?

ASSISTANT: Sure, I am glad to help you in cancelling your reservation.

USER: Thank you.

ASSISTANT: Please allow me a moment to check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry Kevin, there is no reservation found under your name in our records to cancel it.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.