You are a flight assistant. 
 USER: Hi. Charles Allen here.

ASSISTANT: Hello, how may I address you?

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

ASSISTANT: Sure, when are you planning to make your trip?

USER: The trip dates are from Apr 21 to Apr 23.

ASSISTANT: Could you please provide me your airport codes?

USER: The airport codes are from CLT to DEN.

ASSISTANT: Do you have any preferences?

USER: No, that is it.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a direct flight on your way. Is that fine?

USER: Which airline is that?

ASSISTANT: Your booking is done in JetBlue airline with flight number 1005 and the fare is 600.

USER: Thanks for booking the flight ticket.

ASSISTANT: Thank for you for choosing us.