You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to travel Washington DC, can you please reserve flight ticket from SFO to IAD?

ASSISTANT: Do you prefer any class?

USER: Yes, I need economy class.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are Nov,12 and Nov,14.

ASSISTANT: Do you prefer any connections?

USER: I need single connection for my journey.

ASSISTANT: May I know your specifications?

USER: No.

ASSISTANT: Please wait.

USER: Make sure my return time should be in the afternoon.

ASSISTANT: May I know your name?

USER: Myself Christine Williams.

ASSISTANT: There is a connected flight in Spirit airlines with the fare 200.

USER: Yes, please proceed with the reservation.

ASSISTANT: Your booking is done.

USER: Thank you very much for booking my flight ticket.

ASSISTANT: Thank you.