You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Scott.

ASSISTANT: How can I assist you?

USER: I would like to book a ticket from LAS to DFW, can you please help me out?

ASSISTANT: Sure, we are happy to help you. Can you please help me with your trip dates?

USER: I am travelling on these dates September 9th and 11th.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I prefer single connected flight.

ASSISTANT: May I know your specific depart and arrival timings?

USER: I prefer return time in the evening.

ASSISTANT: Is there any class preference for you?

USER: I need a business class.

ASSISTANT: Do you have any specific airline to travel?

USER: I don't have any airline preference.

ASSISTANT: Thanks for providing details, no flights are available based on your requirements. Sorry for the inconvenience.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for availing us.