You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Adams here.

ASSISTANT: How may I help you out?

USER: I am planing to visit a trip in Minneapolis MSP. Could you please help me with booking a flight ticket from LAS?

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

USER: My travelling dates are from 09/18 to 09/20.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.