You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have planned to book a flight from IAD, so please help me in booking a flight.

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

USER: My scheduled dates are on June 6th to 8th.

ASSISTANT: Can you please share your connection limit?

USER: I need a single connection.

ASSISTANT: May I know your name please for documentation purpose?

USER: Sure, my name is Rebecca Garcia.

ASSISTANT: May I know your destination airport code please?

USER: Sure, my destination airport code is SFO.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer an economy class.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Rebecca Garcia, there are no flights available in your route.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.