You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me to book a flight ticket from LAS to DCA?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I will start on Feb, 17 and return on Feb, 19.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No, thank you.

ASSISTANT: May I know your good name please?

USER: Sandra Gonzalez.

ASSISTANT: Do you have any class preference?

USER: No, thanks.

ASSISTANT: We found Frontier airline with economy class and flight number is 1008 with arrival time is 21:00 hours and departure time is 22:00 hours.Shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: You are welcome.