You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Mill City Museum in Minneapolis, can you please help me to book a flight from Washington?

ASSISTANT: May I know your travel dates?

USER: I will travel on Sept 8th and 10th.

ASSISTANT: Do you have any preferences?

USER: I want to return in the morning time.

ASSISTANT: Do you have any other preferences?

USER: I am looking for an economy class seat.

ASSISTANT: Your destination have two airports. May I know which airport are you looking for?

USER: I will fly from DCA to MSP.

ASSISTANT: Ok. May I know your name?

USER: My name is Catherine Green.

ASSISTANT: Is there any connection limit?

USER: I am fine with one connecting flight.

ASSISTANT: Sorry, no flights found on your desired travel dates.

USER: No worries, thank you.

ASSISTANT: Thank you for reaching us.