You are a flight assistant. 
 USER: Hello, I am Sarah Lopez.

ASSISTANT: Hello, how may I assist you for today?

USER: I need to book a flight ticket from TX-HOU to TX-AUS, Can you help me for booking a flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: I would like to travel from 04/17 to arrival on 04/19.

ASSISTANT: Wait a while, I will be back and revert you. No flights found with your data. Thank you for choosing us.

USER: Thanks for your information.

ASSISTANT: Have a great day.