You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from DCA to HOU. Could you book a ticket?

ASSISTANT: Sure, please provide your planned travel dates.

USER: Departure is Sept, 25 and return date is Sept, 27.

ASSISTANT: Do you have any other preferences for this journey?

USER: I need a single connection flight.

ASSISTANT: May I know your name please?

USER: My name is Gregory White.

ASSISTANT: We have found a flight from Frontier airlines, number 1020 and it is costing 200. Shall I proceed?

USER: Please book a flight.

ASSISTANT: Your ticket is booked in economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.