You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

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

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: I am travelling on these dates Nov 15th and 17th.

ASSISTANT: Do you have any connection limit?

USER: I need single connected flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I don't have any other preferences.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: I am sorry to inform you that, non of the airlines is providing a flight on your travel dates and locations to book a flight ticket.

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

ASSISTANT: Can I know your name for documentation purpose?

USER: Susan Baker here.

ASSISTANT: Ok Susan Baker, thank you for utilising our services.