You are a flight assistant. 
 USER: Hello, my name is Gregory King.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to book a flight ticket to HOU from AUS, can you please do it for me?

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, my trip dates are 05/26 and 05/28.

ASSISTANT: Let me check for the availability of flight.

USER: Ok, I will wait for your response.

ASSISTANT: Gregory, there is  flight available with price 700 and the connection is 1 with Southwest airline. Would you like me to proceed with the booking?

USER: I need a flight ticket within the budget of 500.

ASSISTANT: I am sorry to inform you that there is no flight available with lowest fare.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for contacting us, have a great day.