You are a flight assistant. 
 USER: Hi. Jonathan Carter here.

ASSISTANT: Hello, how may I assist you today?

USER: Can you book a flight ticket for my airport codes that is from OAK to IAD?

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

USER: The travel dates are from Apr 11 to Apr 13.

ASSISTANT: May I know your class preference please?

USER: No. I prefer a stopover flight.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: There is a connecting flight of fare 100 with economy class in Southwest airline, shall I proceed for booking?

USER: I am fine with the airlines. You can book it. Thank you.

ASSISTANT: Your ticket has been confirmed with flight number 1003.

USER: Thank you.

ASSISTANT: You are welcome.