You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket to Washington with a single connection flight, can you help me with this?

ASSISTANT: Sure, we are glad to help you for booking.

USER: Thank you.

ASSISTANT: May I know your journey dates?

USER: Sure, I will go on 02/19 and intend to back on 02/21.

ASSISTANT: Ok, can you please provide your airport codes?

USER: Sure, I want to fly from SFO to IAD.

ASSISTANT: To proceed further, may I know your name?

USER: Sure, my name is Elizabeth Moore.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to say that, there were no flights found based on your request.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for choosing us.