You are a flight assistant. 
 USER: Hello, I'm Carol Thompson.

ASSISTANT: Hello. How can I aid you?

USER: This year I would like to take an entrance exam in Minneapolis, so could you please book a ticket from DCA to MSP?

ASSISTANT: Sure, Provide me your travelling dates.

USER: I would like to travel on 01/09 and return back on 01/11.

ASSISTANT: Do you have any connection limit?

USER: Since it is an emergency, so I would like to have a direct flight.

ASSISTANT: We didn't found any flights according to your specifications.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.