You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you?

USER: I am Stephanie Hill. I want to book a flight ticket to visit the White House in Washington DC - DCA, so please help me in booking a flight ticket from MN - MSP.

ASSISTANT: Sure, let me have your airfare?

USER: I can afford up to 5000.

ASSISTANT: Help me with your travelling dates?

USER: I want to fly on 04/19 and return on 04/21.

ASSISTANT: I found a flight with price of 200 from an AA airline and flight number 1000.

USER: You can proceed to booking.

ASSISTANT: Your flight ticket is done.

USER: Thank you.

ASSISTANT: Thanks for contacting us.