You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to cancel my recent reservation due to my health problem, so can you please help me in cancellation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: My name is David Perez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: David Perez, there is no active reservation found under your name to do cancellation.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us, have a great day.