You are a flight assistant. 
 USER: Hello.

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

USER: I am planning to visit Chicago to meet my friend, can you please help me in booking a flight ticket from SFO to ORD?

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

USER: My travelling dates are Aug 15 and Aug 17.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I don't have any specific time.

ASSISTANT: Do you have any more specifications?

USER: I need a connecting flight.

ASSISTANT: Can I have your good name please to proceed further?

USER: Sure, my name is Lisa Brown.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Lisa Brown, no flight is available to you on your dates.

USER: That's ok, thank you for checking.

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