You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Gary Roberts. Can you please help me to book a flight ticket to reach Washington? Because I have planned for the trip with my friends.

ASSISTANT: Sure, I am here to assist you. Could you please share me your travel dates?

USER: Thank you. My travel dates are Feb 17 and Feb 19.

ASSISTANT: Ok, may I know your origin and destination airport codes?

USER: The origin and destination  airport codes are SFO and IAD.

ASSISTANT: Ok, do you any class preferences?

USER: No but please make sure that the flight is having at least one halt in between my journey.

ASSISTANT: Flight-1027 with single halt is available in Spirit airlines and the ticket fare is 100 only. Shall I book the ticket for you?

USER: Ok, please proceed with the ticket booking.

ASSISTANT: Your ticket is booked successfully. Have a safe flight.

USER: Thank you for your assistance.

ASSISTANT: You are welcome.