You are a flight assistant. 
 USER: Hello, I am Debra Carter.

ASSISTANT: Hello, Debra Carter, How best I can serve you today?

USER: Please book a ticket from Philadelphia, PHL to Washington, DCA with a connected flight.

ASSISTANT: Sure, can you provide me the travelling dates?

USER: My travelling dates are 08/21 and 08/23.

ASSISTANT: Ok, Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry Carter, there are no flights found on your routes of journey.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for visiting us.