You are a flight assistant. 
 USER: Hello. I am Sharon Martin.

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

USER: I would like to fly from Austin TX-AUS, to visit Trinity River Audubon Center, which is located in Dallas & Fort Worth to explore the nature. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you with all your travel related request.

USER: Thank you.

ASSISTANT: Can you please share me your travel dates?

USER: My travel dates are 08/26 and 08/28.

ASSISTANT: Please share your destination airport code.

USER: My destination airport code is TX-DFW.

ASSISTANT: Do you have any price limit for this trip?

USER: As my budget is low, I can spend upto 200.

ASSISTANT: Thank you for details, please wait.

USER: Sure.

ASSISTANT: I am sorry to inform you that we don't have any flight available on given dates by you.

USER: Ok, no problem at all. Thank you for your service.

ASSISTANT: Thank you for contacting us, we hope to serve you better next time.