You are a flight assistant. 
 USER: Hello, Gregory Baker here.

ASSISTANT: Hello, how can I help you today?

USER: I would like to travel from IAH to AUS. can you please help me to book a ticket?

ASSISTANT: Sure, when are you willing to fly?

USER: My travelling dates will be on 12/14 to 12/16.

ASSISTANT: Ok, any other requirements?

USER: I need a connecting flight. Price limit is 200.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

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

USER: Ok, not an issue, thank you.

ASSISTANT: Thank you for opting us.