You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

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

ASSISTANT: Ok, I will help you with that. Can I know your travelling dates?

USER: I am planning to travel on Sept 12 and return back on Sept 14.

ASSISTANT: Do you have any other specifications?

USER: Yes, my return time should be afternoon.

ASSISTANT: Do you have any other preferences?

USER: I am looking for a connecting flight.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

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

ASSISTANT: Thank you for approaching us.