You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Ruth Parker from Boston.

ASSISTANT: Nice to meet you Parker.

USER: Thanks, nice to meet you too. I want to go to Washington in December for my business meeting purpose. Can you please help me in flight ticket booking process?

ASSISTANT: I understand your request and will be happy to help you.

USER: Thank you for your positive response.

ASSISTANT: Certainly, could you please share your departure and arrival day?

USER: I want to take off on 12/15 and please confirm my return ticket also on 12/17.

ASSISTANT: Well, may I know your location airport codes?

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

ASSISTANT: Parker, all flight tickets are sold out on your requested travelling dates.

USER: Oh! It's ok no problem, I will contact another airline agency. Thank you for your information.

ASSISTANT: My pleasure.If any questions arise, please feel free to contact us at any time.