You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: Can you please book the ticket from PHL to OAK? As I need to participate in trekking at Oakland hills.

ASSISTANT: Sure, I am gleeful to help you with that. May I know your travelling dates?

USER: Sure, I would like to depart from my source location on 27th Sept and I want to return back by 29th Sept.

ASSISTANT: Can I know your connection limit?

USER: I need direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Nancy Mitchell.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us, have a great day.