You are a flight assistant. 
 USER: Hello, Lisa Nelson here.

ASSISTANT: Hello Lisa, I would like to know how can I assist you at this pleasant evening?

USER: I would like to visit Ford's Theatre, could you book a ticket from HOU to IAD?

ASSISTANT: Sure, please provide me your travelling dates.

USER: My travel dates are 04/19 and 04/21.

ASSISTANT: There is a flight available with us in JetBlue airline. Can I know your budget please?

USER: I can afford 500.

ASSISTANT: Ok, this flight fare is with in your budget.

USER: Please confirm my ticket.

ASSISTANT: Can I proceed? Ok, your ticket is confirmed with the flight number 1016.

USER: Thank you for booking my ticket.

ASSISTANT: It's my pleasure.