You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Mark Mitchell. I have a plan to attend nature festival in AUS, can you please book a flight ticket from LGA?

ASSISTANT: Sure, can I have your planned travel dates please?

USER: My travelling dates are Dec 26th and Dec 28th.

ASSISTANT: Do you need a connecting flight?

USER: No, I need a direct flight.

ASSISTANT: May I know your departure and arrival timings?

USER: The depart time should be afternoon.

ASSISTANT: May I know your class preferences?

USER: No, I don't have any class preference.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Mark Mitchell, no flights has been found on your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.