You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Benjamin Campbell here. I want to visit Austin zoo with my family, please book my ticket from JFK to AUS.

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please let me know your preferable travel dates for booking flight ticket?

USER: My itinerary dates are 08/10 and 08/12.

ASSISTANT: Please hold on a moment, I will check flight availability in this route as per your requested dates.

USER: Sure.

ASSISTANT: There is a flight available in this route as per your requested dates, airline is Southwest and connection limit of this airline is 1 with minimum fare of 600. Are you ok with this flight?

USER: I can afford 500 for my ticket.

ASSISTANT: Ok, please give me a moment, I will check with that.

USER: Sure.

ASSISTANT: Sorry no flights are available in this route as per your requested budget limit.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.