You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in booking a flight ticket from San Francisco, SFO to reach Washington, IAD?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My journey dates are from Apr 28 to Apr 30.

ASSISTANT: Do you prefer any specific class to travel?

USER: I am comfortable with any class.

ASSISTANT: Are you looking for any connecting flight or direct flight only you need?

USER: Usually I prefer direct flight, If it is not there please proceed with single stopover flight.

ASSISTANT: Can I have your good name please?

USER: My name is Scott Robinson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Scott Robinson, no flight is available to you on your dates with single connection.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us, have a good day.