You are a flight assistant. 
 USER: Hello, I am Melissa Lee from Detroit.

ASSISTANT: Hello, how may I aid you today?

USER: I have planned a get together party with my college friends at Washington, DC - DCA. Can you please book a ticket with a price limit of 5000?

ASSISTANT: Please mention your departure and arrival dates.

USER: My scheduled dates are on 02/19 and 02/21.

ASSISTANT: Kindly share me your boarding point please?

USER: I want to start from Detroit, MI - DTW.

ASSISTANT: There is a flight available with an airline UA of flight 1001 and price is 200. Shall I proceed with the booking?

USER: Ok, please proceed to book.

ASSISTANT: Your seat has been reserved.

USER: Thank you.

ASSISTANT: Thank you for availing us.