You are a flight assistant. 
 USER: Hello, Betty Lopez here.

ASSISTANT: Hello, How can I aid you?

USER: I have a plan to visit US capitol, if you book a flight ticket from MSP to DCA.

ASSISTANT: Sure, May I know your travelling dates?

USER: July 8 and 10 my planned travel dates.

ASSISTANT: Do you have any preferences?

USER: I need a halt in my journey.

ASSISTANT: Thanks for your details.

USER: You are welcome.

ASSISTANT: There are no flights found on your data. Thank you.