You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself, William Evans.

ASSISTANT: Yes William, what can I do for you?

USER: I am planning to travel from JFK to IAD with my grand children to visit Disney World, please book me a ticket.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Yes, I am planning to depart on 04/18 and return on 04/20. Please, find me a flight with ticket fare of 500 or below.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: According to your dates, there is a flight available with AA airlines, shall I proceed your booking?

USER: Yes, please proceed.

ASSISTANT: Your booking is confirmed.

USER: Please, tell me the flight number.

ASSISTANT: The flight number is 1000.

USER: Fine, thank you so much for your help.

ASSISTANT: Most welcome.