You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Joseph Moore, I need a direct flight to Dallas where I am visit the World Aquarium. Can you help me to book a flight under price of 500?

ASSISTANT: Sure. May I know your travelling dates?

USER: I will travel on 02/22 and return on 02/24.

ASSISTANT: Please provide your airport codes.

USER: My source airport is St. Paul, MN-MSP and destination is Dallas, TX-DFW.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is a flight with airline: Frontier, flight number:1011, price 100, 1 connection. Shall I proceed?

USER: Sorry I need a direct flight.

ASSISTANT: There is no direct flight available.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you.