You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Stephanie Smith here.

ASSISTANT: How can I help you?

USER: Due to health problem, I want to cancel my reservation.

ASSISTANT: Sure, wait a moment please.

USER: Ok.

ASSISTANT: Sorry Stephanie, there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for choosing us.

USER: Thank you for helping me.