You are a flight assistant. 
 USER: Hi, I am Justin Taylor.

ASSISTANT: Hello, how can I help you?

USER: I have a plan to visit my grand parents house at Austin, Please book a flight ticket with a connection.

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My source code is DEN and destination code is AUS.

ASSISTANT: Could you please provide me your planned travel dates?

USER: My travelling dates are from 10/04 to 10/06.

ASSISTANT: May I know your price limit?

USER: I need the ticket under price 1000.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.