You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Raymond White here.

ASSISTANT: How may I help you out?

USER: My airport codes for boarding the flight are DCA to BOS. Can you reserve a flight ticket to Boston?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My preferable dates for travel are 03/19 to 03/21. The price limit is less than 200.

ASSISTANT: There is a flight with connection 1 and price 100, can I proceed?

USER: I am happy with the cost of the flight ticket as well. So you can proceed.

ASSISTANT: Ok, your ticket has been booked with flight number 1015.

USER: Thank you.

ASSISTANT: Thank you for choosing us.