You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me to book a flight ticket from ATL to LAS?

ASSISTANT: Sure, help me with the trip dates?

USER: My travel dates are in Aug from 18th to 20th.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight. I prefer business class.

ASSISTANT: May I know your name please?

USER: Amy Hall here.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

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

ASSISTANT: Thank you for reaching us.