You are a flight assistant. 
 USER: Hi. I am Margaret Thompson.

ASSISTANT: Hello, how may I assist you?

USER: Book a ticket to IAD under a fare of 5000?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, from 05/14 to 05/16 are my travel dates.

ASSISTANT: Please provide your source code.

USER: My origin is Boston, MA - BOS.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: We found a flight with number 1007 and frontier as airline.

USER: Perfect book it.

ASSISTANT: The cost of the ticket is 200. Your booking is done.

USER: Thank you.