You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in flight ticket booking process from PHL to DCA?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Thank you for your response, I want to take off on Feb 26 and book my return ticket also on Feb 28.

ASSISTANT: Do you have any connection limit preference?

USER: I will prefer direct flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: Sure, my name is Michelle Roberts.

ASSISTANT: Michelle Roberts, there are no flight services available on this route with your requirements.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.