You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I need to attend a seminar at Oakland, can you help me to book a flight ticket from AUS to OAK?

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

USER: My travel dates are Apr 16 and Apr 18.

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

USER: I would like to depart in the evening time.

ASSISTANT: Do you have any more specifications?

USER: My connection limit is 1.

ASSISTANT: Can I have your good name please?

USER: My name is Dennis Brown.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Dennis Brown, no flight is available to you on your dates in the evening time.

USER: No problem, thank you for the information.

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