You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from LAS to DFW.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Departure date is Feb, 9 and return by Feb, 11.

ASSISTANT: Do you have any other specifications?

USER: I would be comfortable with single stop over.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: Please help me with your name for booking.

USER: My name is Ronald Parker.

ASSISTANT: No flights found as per your preferences at the moment.

USER: Thank you.

ASSISTANT: Thank you for choosing us.