You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me with booking ticket from ORD to MCO, to meet my school teacher.

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

USER: Ok, my travelling dates are from May 21 to 23.

ASSISTANT: Do you have any limits on number of connections?

USER: Ok, I need a direct flight.

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

USER: No.

ASSISTANT: May I know your name for the booking process?

USER: David Lopez here.

ASSISTANT: Sorry, no flights are available on your required dates.