You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book a flight ticket from ORD to LGA?

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

USER: My travelling dates are Apr 10 to Apr 12.

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

USER: I need a single connection of flight.

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

USER: I want to return in the afternoon.

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

USER: Frank Parker.

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

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.