You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travel dates are from Jan 22 to Jan 24.

ASSISTANT: May I know your name please?

USER: I am Susan Thomas.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Sorry, there is no flight running on your route.

USER: Ok no problem. Thank you.

ASSISTANT: Thanks for choosing us.