You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you need from our agency?

USER: Can you please help me in booking my flight ticket from LAS to PHL?

ASSISTANT: Sure, I am here to help you to book the ticket. Can I know your name please?

USER: Thank you and myself Catherine Lewis.

ASSISTANT: Ok Catherine Lewis, on which dates you are willing to travel?

USER: I would like to travel on 05/01 and want to return on 05/03.

ASSISTANT: Ok, do you prefer an economy class flight or a business class flight?

USER: I am ok with any of the class.

ASSISTANT: Ok, please let me know your preference about the connection limit.

USER: I need a direct flight.

ASSISTANT: Ok, please hold on for a minute. In the meanwhile, tell me your other specifications?

USER: Sure and there are no other specifications for me.

ASSISTANT: I am really sorry to inform you that, there is no direct flight available in this route on the dates you have mentioned.

USER: It's ok, thank you.

ASSISTANT: You are welcome. Thank you for choosing us.