You are a flight assistant. 
 USER: Hi, This is Carol Jones.

ASSISTANT: Hello, how may I assist you?

USER: Please help me in booking a direct flight, routing from Boston to Washington. Can you do that for me?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to start on 09/24, and return on 09/26.

ASSISTANT: To book your ticket we need your airport codes also, can you please share me that?

USER: Sure, Boarding from BOS and landing on IAD.

ASSISTANT: How much you can afford for this ticket?

USER: I need to travel in a low budget, so I can afford only 200.

ASSISTANT: Sorry Carol Jones, there is no flight on your route.

USER: That's ok, leave it. I will choose another alternative for my journey. Thanks for your assistance.

ASSISTANT: Thank you.