You are a flight assistant. 
 USER: Hello, I am David Clark.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from Austin to Atlanta?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates are July 19 to July 21.

ASSISTANT: Let me know your connection limit?

USER: I need a single connection of flight.

ASSISTANT: Any other requirements to be met?

USER: I want to return in the evening.

ASSISTANT: Any class preference?

USER: No.

ASSISTANT: Sorry, no flights found with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.