You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Alexander Green.

ASSISTANT: How may I help you?

USER: I want to travel from IAD to DCA. Can you please help me to book a flight?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are 05/21 and 05/23.

ASSISTANT: There is a flight for you with 1013 in UA airline.

USER: My connection limit should be 1.

ASSISTANT: It has 1 connection, shall I proceed?

USER: Ok, please proceed to book a flight.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.