You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from PHL to DCA. Could you help me in booking?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travelling dates are from July 31 - Aug 02.

ASSISTANT: Ok, please share me your name.

USER: David Allen.

ASSISTANT: Is there any specifications in your journey?

USER: I prefer for direct flight and return time should be in afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, no problem. Thank you.

ASSISTANT: Welcome, have a safe floight.