You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you help me in booking flight ticket to reach Austin, within range 1000?

ASSISTANT: Sure, please share your planned trip dates?

USER: As I have planned to start my journey on 12/26, and book my return ticket on 12/28.

ASSISTANT: Ok, any other requirements to be met?

USER: Yes, I am looking for a connecting flight, for my journey.

ASSISTANT: Please provide your boarding and landing airport codes?

USER: I want to board from Hartsfield–Jackson Atlanta International Airport, ATL. As it was my nearest airport. I will land at TX - AUS.

ASSISTANT: Ok, can I have your name please?

USER: Sure, Donald Williams is my name.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: That's ok, not an issue. I will check another alternative for my journey. Thanks for your kind information.

ASSISTANT: Thank you for opting us.