You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am Jonathan Wilson.

ASSISTANT: Nice meeting you Wilson.

USER: Thanks, I want to go to Seattle next week, can you please book a flight ticket for me?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your planned dates of travelling?

USER: Thank you, I want to take off on 06/01 and book my return ticket also on 06/03.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: I would like to fly from DCA and destination airport is SEA.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us, have a great day.