You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: As I need to attend a concert in Washington, please aid mew in booking flight ticket from DTW to IAD.

ASSISTANT: Sure, I can help you. Could you please share your departure and arrival day?

USER: I prefer to travel in between Feb 26 and Feb 28.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a connected flight.

ASSISTANT: May I know your name?

USER: Myself Brandon Collins.

ASSISTANT: Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER: Sure.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, not an issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.