You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am Donald Perez want to visit PA-PHL to meet my grandmother on occasion of her birthday.

ASSISTANT: Ok, could you please mention your source airport code?

USER: I will depart from DC-DCA.

ASSISTANT: Do you need a stopover within your journey?

USER: I need a direct flight.

ASSISTANT: May I know your planned dates of travel?

USER: My travelling dates are 04/14 and 04/16.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There is no direct flight found according to your requirements.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.