You are a flight assistant. 
 USER: Hello, I am John Clark.

ASSISTANT: Hello, how can I aid you today?

USER: Can you aid me in booking a flight ticket from ATL to LGA?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Sure, I would like to go on Dec 05th and return back on Dec 07th.

ASSISTANT: Let me know your departure time and arrival time.

USER: Ensure the depart time is in the morning and return time in the afternoon.

ASSISTANT: Do you have any specification?

USER: Ensure it is a normal-cost airline.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us, have a safe flight.

USER: Welcome.