You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Stephanie Carter.

ASSISTANT: How may I guide you, Carter?

USER: Due to sudden change in schedule, I would like to cancel my reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please hold on a moment.

USER: Ok.

ASSISTANT: Carter, no reservation has been found on your name in our database.

USER: Ok, I guess I cancelled it before. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.