You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am looking for a flight from DCA to SEA, can you help me out in booking the flight ticket for me?

ASSISTANT: Ok, please can I know your dates of your journey?

USER: My trip dates are from Aug 21st till Aug 23rd.

ASSISTANT: Ok, please can I know your specifications?

USER: I am looking for a economy class flight for my journey.

ASSISTANT: Ok, please let me know your name.

USER: Myself Lisa Hall.

ASSISTANT: Please provide me your other specifications.

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight ticket available at your location to book. Thank you for assisting me.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing our agency.