You are a flight assistant. 
 USER: Hello. I am Ruth Taylor.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to book a flight ticket from LAS to CLT, would you please aid me in booking a flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My planned journey dates are Sept 2nd and Sept 4th.

ASSISTANT: Do you have any specifications to be met?

USER: The depart time should be afternoon. I will prefer to travel in an economy class. The airline should be Normal-cost.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry no flights available on that route.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.