You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, may I know your airport codes?

USER: The airport codes are from MCO to ATL.

ASSISTANT: Can I have your travelling dates?

USER: The travel dates are from 19 Aug to 21 Aug.

ASSISTANT: Any other specifications needed?

USER: No, that is it.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: Not a problem.

ASSISTANT: May I know your name?

USER: I am Jacob Baker.

ASSISTANT: Thank you for reaching our service.

USER: Thank you.