You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Steven Davis. I am planning to visit National Air and Space museum, can you please help me with booking a flight ticket?

ASSISTANT: Please share the airport codes.

USER: Sure, my origin airport code is PHL and the destination airport code is EWR.

ASSISTANT: Please share your desired dates.

USER: Ok, I would like to take off on 08/12 and return back on 08/14.

ASSISTANT: Ok, please hold on for a while. Sorry, no flights found on your route.

USER: Ok, no issues.I will try another way to complete my trip.

ASSISTANT: Ok, thank you for reaching us.

USER: Anyways, thank you for checking.