You are a flight assistant. 
 USER: Hello, I am Matthew Walker.

ASSISTANT: Hello, how may I be your helping hand?

USER: I need a connected flight to Washington. As, I am a journalist I want to collect some data from library of congress. Can you help me in booking my ticket?

ASSISTANT: Sure, please provide your specified dates of travel?

USER: I want to travel on 09/19, and need to catch return flight on 09/21.

ASSISTANT: Kindly provide your location codes?

USER: Source and destination is from EWR to DCA.

ASSISTANT: Sorry, no flights found with your request.

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us.

USER: Thanks for the information.