You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking a flight ticket from MSP to LAS?

ASSISTANT:  Sure, may I know your travelling dates?

USER: My travel dates are from Aug 19 to Aug 21.

ASSISTANT: On which name shall I reserve flight ticket?

USER: Please reserve under the name Dorothy Robinson.

ASSISTANT: Do you need any specifications?

USER: Yes, I would prefer business class for my trip.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.