You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am Donald Baker, willing to travel from Philadelphia on 04/17 to attend my friend's marriage and will return on 04/19. Can you book a ticket? The price limit I can afford is 200.

ASSISTANT: Sure, can you please share your connection limit?

USER: I need one connecting flight.

ASSISTANT: Ok, also provide your journey codes for further process.

USER: My travelling codes are PHL-DCA.

ASSISTANT: Thank you, no flight found  matching your details.

USER: Ok, thanks for providing information.