You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today from my end?

USER: Jennifer Green here. I would like to make a trip to Austin for my vacation, can you please help me in booking a flight ticket from DTW to AUS?

ASSISTANT: Sure, I am here to help you out. Please mention me your trip dates.

USER: Sure, my trip dates are from 09/19 to 09/21.

ASSISTANT: Please mention me your specification of flight, you need from our agency.

USER: I need a connecting flight and my price limit should not exceed 500.

ASSISTANT: I regret to inform you that, there is no flight with your travel dates. Sorry for inconvenience caused.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.