You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kenneth Robinson here.

ASSISTANT: Kenneth Robinson, how may I assist you today?

USER: I am planning to go for a trip to LGA. Can you book a flight ticket from ATL?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: Apr, 11 and Apr, 13 are my planned travel dates.

ASSISTANT: Please help me with your class preference.

USER: I am comfortable with any class.

ASSISTANT: May I know if you need a direct or connecting flight please?

USER: I need a connecting flight.

ASSISTANT: Please help me with your preferred depart and return time.

USER: My depart time should be at afternoon.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Kenneth Robinson, I am sorry to inform you that there are no active flights as per your needs.

USER: That's ok, no problem.

ASSISTANT: Thank you for understanding.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.