You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My concern is regarding the flight ticket booking from JFK to DCA, can you help me out?

ASSISTANT: Can I know your travelling dates?

USER: Ok, please book for the dates Aug 1st and 3rd respectively.

ASSISTANT: Do you have any preference?

USER: Ok, please book a connecting fight and the class I need is economy.

ASSISTANT: Can I know your name?

USER: Ok, please check for the airline's which is normal cost. My name is Dorothy Young.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you.