You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am unable to travel on the dates which I have booked last week but I am not feeling well. Could you please help me in cancelling?

ASSISTANT: Sure, I am ready to help you with cancelling your reservation.

USER: Thank you.

ASSISTANT: Can I have your name please to check your reservation status?

USER: My name is Alexander Lee.

ASSISTANT: Ok, please be hold on for a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry Alexander Lee, no reservation has found under your name to cancel.

USER: It's ok, thank you for searching for my ticket reservation.

ASSISTANT: My pleasure. Thank you for choosing us, have a good day.

USER: You are most welcome.