You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Gregory Thompson. I am planning to meet my colleague in Boston, so please book a flight ticket from MCO to BOS.

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on Nov 21, return on Nov 23.

ASSISTANT: May I know your specification?

USER: My return time should be afternoon.

ASSISTANT: Please wait a moment.

USER: Sure, I want a direct flight.

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

USER: No problem, thank you.

ASSISTANT: Thank you for reaching our service.