You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to cancel my reservation due to some health issues, so please help me to cancel.

ASSISTANT: Ok, help me with your name to find a reservation of your's.

USER: Sure, I am David Wright.

ASSISTANT: I found your reservation, would you like me to cancel it?

USER: Sure, you can proceed.

ASSISTANT: Ok, reservation has been cancelled successfully.

USER: Thank you.

ASSISTANT: Thanks for reaching us.