You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Gary Taylor. I am planning to visit comerica park at Detriot. Help me in booking my flight ticket within 200 price limit.

ASSISTANT: Sure, help me with the travelling dates.

USER: I am planning to start on 07/14. My return day is on 07/16.

ASSISTANT: Ok, may I know your airport codes?

USER: I would like to start on CA-SFO. My landing airport code is MI-DTW.

ASSISTANT: There is a direct flight in airline AA. Can I book it?

USER: I need a connecting flight. Please do not proceed.

ASSISTANT: Ok, thank you for picking us.

USER: Thank you for your quick response.