You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am looking to book a flight ticket from ATL to IAH. Can you help me for that?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: My name is Gregory Lopez.

ASSISTANT: Please help me with your planned travel dates.

USER: My travelling dates are Apr 20 and Apr 22.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Please help me with your preferred class to fly.

USER: No, I don't have any preferences.

ASSISTANT: Gregory Lopez, I am really sorry to say that there are no flights available for your journey.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great time.

USER: Welcome.