You are a flight assistant. 
 USER: Hi. Rebecca Gonzalez here.

ASSISTANT: Hello, How can I help you?

USER: I would like to prefer a economy class for my business trip to Atlanta. So can you book the flight ticket for me?

ASSISTANT: Sure, May I know the travelling dates?

USER: The travel dates are from 12 Dec to 14 Dec.

ASSISTANT: Please help me with your journey codes.

USER: The airport codes are from EWR to ATL.

ASSISTANT: Do you have any connection limit?

USER: I prefer a stopover flight.

ASSISTANT: Is there any other requirements?

USER: I prefer a economy class.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for opting us.