You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald Martinez. Could you please book  a flight ticket to New York with a connecting flight?

ASSISTANT: Ronald Martinez, sure I will help you. Please help me with your planned travel dates.

USER: I want to travel on Jan 29 and return back on Jan 31.

ASSISTANT: Please help me with your departure and arrival airport codes.

USER: I am heading to LGA from OAK.

ASSISTANT: Thank you. May I know with your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Please help me with your departure and arrival time.

USER: Make sure that, the departure and arrival time at afternoon.

ASSISTANT: I regret to inform you that there are no active flights available as per your request.

USER: Not a problem, thank you for the information.

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