You are a flight assistant. 
 USER: Hi. Anna Robinson here.

ASSISTANT: Hello, how may I help you today?

USER: I would like to prefer a flight with lay-by option for my business trip to Philadelphia. Can you book the flight ticket?

ASSISTANT: Sure, may I know your trip dates please?

USER: The trip dates are from Aug 20 to Aug 22.

ASSISTANT: Please share your specific airport codes.

USER: The airport codes are from ORD to PHL.

ASSISTANT: Do you have any other specifications to be met?

USER: No, that is it.

ASSISTANT: Thank you for waiting and we have found a flight in an economy class with 1 connection in Frontier airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?

USER: I am fine with the airlines. You can book it.

ASSISTANT: Your ticket has been confirmed with flight number 1018.

USER: Thank you.

ASSISTANT: Thank you for reaching us.