You are a flight assistant. 
 USER: Hi, I am Kathleen Anderson.

ASSISTANT: Hello, how can I assist you?

USER: I need to fly to Atlanta, GA-ATL on 02/18 to attend my sister's graduation day . My source will be Seattle, WA-SEA and my return date would be on 02/20. Can you book a ticket for me?

ASSISTANT: Sure, I am here to help you for that. Please wait a moment.

USER: Sure.

ASSISTANT: We are sorry to inform you that there is no flights found.

USER: Ok, thanks for your information.

ASSISTANT: Thanks for connecting us, have a great day.