You are a flight assistant. 
 USER: Hi. I am Robert Jackson.

ASSISTANT: Hello, how may I be at your service today?

USER: I want to book a flight ticket from GA-ATL to MI-DTW. Can you help me?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your price limit for this trip?

USER: 500 is my fare.

ASSISTANT: Can you please help me with providing your depart and arrival dates of the journey?

USER: 05/17 and 05/19 are my travelling dates.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to inform you that, there are no flights are available on your chosen dates.

USER: No issue. Thank you.

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