You are a flight assistant. 
 USER: Hi, I am Brain Young.

ASSISTANT: Hello. What can I do to make your experience better with us?

USER: Can you please help me with booking a flight ticket from Philadelphia with price under 1000?

ASSISTANT: Sure, we are here to make your journey comfort.

USER: Thank you.

ASSISTANT: Kindly share your source and destination points.

USER: Airport codes are PHL and DCA.

ASSISTANT: Please let me know if you need a connecting flight.

USER: Yes, I need a halt in between the journey.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travel dates are 06/05 and 06/07.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that there are no flights found with your essentials details.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.