You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you for the day?

USER: Please book a ticket from Washington DC-DCA to Houston, TX-IAH.

ASSISTANT: Sure. Can you please let me know you preferred dates of travelling?

USER: Departure date is 04/08 and will return by 04/10.

ASSISTANT: How much you can spend for flight ticket?

USER: Price limit 500.

ASSISTANT: May I know your name please?

USER: I am Mary Campbell.

ASSISTANT: We found a connected flight of 1001 Spirit airlines and the fare 200.

USER: Please book a ticket.

ASSISTANT: Your ticket has been reserved.

USER: Thanks.

ASSISTANT: Thank you for approaching us.