You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Andrew Collins.

ASSISTANT: Andrew, how may I aid you today?

USER: I'm planning to visit Walker Art Center on 09/12, can you please book the ticket from DCA?

ASSISTANT: Can I know the return details?

USER: My return day will be on 09/14 from MSP.

ASSISTANT: I am extremely sorry that there are no flights matching with your preferences.

USER: That's so sad. Anyways, thank you for your time.

ASSISTANT: Thank you, have a good day ahead.