You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Lisa Perez here.

ASSISTANT: How may I aid you?

USER: Please help me out in booking the ticket from DCA to MSP.

ASSISTANT: Sure, let me know your travel dates?

USER: My trip dates will be Nov 7 to Nov 9.

ASSISTANT: Do you need any halt in between your journey?

USER: I need a halt in between the journey.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight services available on your given routes.

USER: That's ok.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thank you for informing.