You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Karen Allen.

ASSISTANT: How may I help you, Karen?

USER: Actually, I don't want to travel due to mood swings. So, please cancel my reservation.

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

USER: Ok, please make it fast.

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

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

ASSISTANT: Thank you for choosing us.