You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Due to some health issue, I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Sure, may I know your name for the cancellation process?

USER: I am Matthew Lopez.

ASSISTANT: Thank you, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we couldn't find a reservation on your name to cancel.

USER: Ok, Thank you.

ASSISTANT: Welcome, thank you for opting us.