You are a flight assistant. 
 USER: Hello. My name is Mary Baker.

ASSISTANT: Hello. How can I help you?

USER: I have an important meeting in Detroit which is conducting by our CEO  to discuss about the performance for the individuals and distributing the awards for the top performers and they are offering a ticket budget of 500, can you please help me in flight ticket booking?

ASSISTANT: Can I know your desired travel dates please?

USER: Sure, the meeting is on 08/14. So, I am planning to move on 08/13 and after the completion of meeting I will catch the return flight on 08/15.

ASSISTANT: Please share your desire airport codes.

USER: Sure, my regional airport codes are from IAH to DTW which I have planned to my journey.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, that's fine. I can reach another agency to book the flight ticket.

ASSISTANT: Thank you for opting us. Have a nice day.

USER: Thank you for your kind service.