You are a flight assistant. 
 USER: Hello. I am Donald Collins.

ASSISTANT: Hello, how may I assist you now?

USER: I want to cancel my recent reservation, due to ill health. Can you please help me?

ASSISTANT: Sure,I will help you with cancellation.

USER: Thank you for your positive response.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

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

ASSISTANT: Thank you for visiting us.