You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a ticket from LAS to ATL. Could you book a ticket?

ASSISTANT: Sure, can I know your journey dates?

USER: Departure is Jan, 9 and return date is Jan, 11.

ASSISTANT: Could you please help me with your airline preference?

USER: I prefer normal-cost airline.

ASSISTANT: Do you have any other specifications?

USER: I need connecting flight.

ASSISTANT: Can I know your class preference?

USER: I am comfortable with any class preference.

ASSISTANT: May I know your good name?

USER: My name is Brandon Young.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Thank you.

ASSISTANT: Thank you for choosing us.