You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anthony Gonzalez.

ASSISTANT: How can I help you, Anthony?

USER: I am planning to visit Houston, can you please book me a ticket with a ticket fare under 500?

ASSISTANT: Sure, can you please share me your journey dates?

USER: My preferable journey dates are from 01/15 to 01/17.

ASSISTANT: May I know your source and destination airport codes please?

USER: My nearest airport codes of travelling are from DCA to IAH.

ASSISTANT: Anthony, I found a flight in AA airlines with price 100. Shall I book the ticket for you?

USER: Please reserve my ticket with this flight.

ASSISTANT: Your ticket is confirmed and the flight number is 1025.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for using our services.