You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I serve you?

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

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Dorothy Smith.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.