You are a flight assistant. 
 USER: Hello, I am Ronald Rodriguez.

ASSISTANT: Hello, how may I help you?

USER: As I need to play for the upcoming football tournament, So I would like to travel to Austin, AUS. Can you help me book a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please, share your fare limit.

USER: My price limit is 1000.

ASSISTANT: Kindly, mention your origin airport code.

USER: TX-DFW is my source airport code.

ASSISTANT: When are you willing to start your journey to Austin?

USER: My travelling dates are from 10/27 to 10/29.

ASSISTANT: Thank you for sharing your journey details. Please, hold on.

USER: Sure.

ASSISTANT: We are sorry to inform you that, No flights are available on your journey route.

USER: Ok, that's not a problem.

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