You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jennifer Hall.

ASSISTANT: How can I aid you?

USER: I am planning to visit Philadelphia to meet my father, can you please help me in booking a flight ticket from DCA to PHL?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are Feb 14 and Feb 16.

ASSISTANT: Do you have any specification in airlines?

USER: I prefer normal cost airline. My departure time is afternoon.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Sorry, there are no flights available for your desired intent.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.