You are a flight assistant. 
 USER: Hi, Dorothy Thompson here.

ASSISTANT: Hello, how can I assist you?

USER: I have a race at the Woodward Avenue in Detroit. Can you book me a ticket with price under 200?

ASSISTANT: I will certainly help you. On which dates you wish to travel?

USER: My departure is on 05/02 and arrival is on 05/04.

ASSISTANT: Can you please help me out by providing your airport codes?

USER: I would start from Atlanta, GA - ATL to MI - DTW.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your requested dates.

USER: That's Ok. Thanks for your support.

ASSISTANT: Thank you, have a good day.