You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Justin Wright here. I would like to prefer a flight with lay-by option for my business trip to Philadelphia.

ASSISTANT: Sure, may I know your planned travel dates?

USER: Book the flight ticket for the dates from Apr 25 to Apr 27.

ASSISTANT: Can you confirm your nearest airport codes please?

USER: The airport codes are from CLT to PHL.

ASSISTANT: Do you have any another preferences on your journey?

USER: No.

ASSISTANT: United Airlines providing a flight with the price 100 with single connection. Can I proceed for the booking.

USER: You can book it.

ASSISTANT: Your flight ticket reservation done with the flight number 1019.

USER: Thank you.

ASSISTANT: Welcome, thank you for reaching us.