You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to book a connecting flight on 09/27?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source airport code is SFO and my destination airport code is IAD.

ASSISTANT: You need any return flight for your journey?

USER: I am planning to return to my home town on 09/29.

ASSISTANT: Wait for a while please.

USER: Sure.

ASSISTANT: Southwest airlines is available in your route with the ticket fare of 100, shall I proceed with the booking?

USER: Proceed with booking.

ASSISTANT: Your ticket is booked with the connecting flight-1020.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.