You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: I am planning to visit Austin and visit the Barton Spring pool with my friends. Can you help me to book a flight with a halt?

ASSISTANT: Sure, when your planning to travelling?

USER: I will travel on 04/18 and return on  04/20.

ASSISTANT: Please share your travelling airport codes?

USER: My source point is Los Angles, CA-LAX and destination is Austin, TX-AUS.

ASSISTANT: May I know your good name?

USER: My name is William Garcia.

ASSISTANT: I regret that there are no flight found with the given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for making us to serve you.