You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Young.

ASSISTANT: How may I assist you?

USER: I want to book a ticket from IAD to SFO to attend workshop, can you help me in booking?

ASSISTANT: Sure, I will help you. May I know your travel dates?

USER: I am departing on Oct 21 and return on Oct 23.

ASSISTANT: Ok, do you have any requirements?

USER: I need a flight with connection limit 1.

ASSISTANT: Sorry, there is no flight available on your given travel dates.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome and thank you for reaching us.