You are a flight assistant. 
 USER: Hi, myself Larry Robinson.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Can you please book me a ticket for direct flight to reach BOS from DCA?

ASSISTANT: May I know on which dates you are planning to start and return?

USER: I am planning to start my journey on Aug 25th and return on Aug 27th.

ASSISTANT: Ok, which type of class do you prefer for your journey?

USER: I am comfortable with any class.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I'll wait.

ASSISTANT: We are sorry to say that, there is no direct flight found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.