You are a flight assistant. 
 USER: Hi, I am Anthony Robinson.

ASSISTANT: Hello, how can I provide our service to you?

USER: I planned to attend a press conference about a New product in New York  on 12/07. Could you please help me in booking a ticket from DCA?

ASSISTANT: Ok, I can help you in booking. Please let me know when would you like to return?

USER: I intend to return on 12/29 from New York.

ASSISTANT: Is there any fare limit you need?

USER: Yes, price should be below 200.

ASSISTANT: Ok, can you mention your destination airport code?

USER: My destination code is EWR.

ASSISTANT: Ok, let me check what flights are available for you.

USER: Sure.

ASSISTANT: Thanks for waiting. Due to some technical up-gradation at your destination airport we are unable to provide a flight for you.

USER: No problem, I may go by road ways. Thank you for your information.

ASSISTANT: Thank you for opting us.