Hello, myself Kevin Allen.
user
Hello, how may I help you?
assistant
I would like to attend my friend's wedding anniversary, please book a ticket from SFO to DTW. My planned dates are 09/18 and 09/20.
user
Thank you for providing the details. Please wait while I search for the availability of flights.
assistant
Sure, take your time. Make sure that the price is below 500.
user
Kevin, there are no flights available for you at this moment with your price constraints.
assistant
Ok, thank you for your information.
user
Thank you for contacting us.
assistant