You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I am planning to book a ticket from PHL to OAK. Can you please help me out?

ASSISTANT: Sure, could you please share your trip dates?

USER: I am planning to travel on Mar 22 and return back on Mar 24.

ASSISTANT: Do you have any specifications?

USER: Yes, my depart time is afternoon..

ASSISTANT: Please let me know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your good name to proceed further?

USER: My name is Brian Nelson.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for reaching us.