You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am David Green. I am planning to cancel my recent reservation, due to health issue.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Can you please cancel my ticket?

ASSISTANT: As per your request the reservation is cancelled on your name.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for opting us.