You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Gregory Wright and I want to attend my friend's birthday at DC-IAD.

ASSISTANT: May I know your dates of journey?

USER: My travelling dates are from 10/21 to 12/23.

ASSISTANT: Do you have any connections?

USER: I need a direct flight.

ASSISTANT: Please let me know your source airport code?

USER: My source code is MA-BOS.

ASSISTANT: Ok, please wait for sometime.

USER: Ok.

ASSISTANT: Thanks for being patient. Sorry, there is no flight found with your specifications.

USER: No issue. Thank you.

ASSISTANT: Thank you and have a nice day.