You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: May I know the journey dates please?

USER: I want to start on Sept 18 to Sept 20.

ASSISTANT: Is there any class preference?

USER: I would prefer economy class.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Are there any more preferences?

USER: I want to depart in the morning.

ASSISTANT: May I know your name please.

USER: Steven Green here.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Steven Green, sorry to inform that there are no flight on your route with the given dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.