You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How exactly I can serve you the best today?

USER: Can you help me booking a flight ticket from IAD to DCA?

ASSISTANT: Sure, we are happy to assist you in booking.

USER: Thank you.

ASSISTANT: Can I know your name please?

USER: I am Larry Hernandez.

ASSISTANT: May I know your planned travelling dates to proceed further?

USER: I will start on 04/18 and return on 04/20.

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

USER: I need a break in my journey.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.