You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you help me in booking my flight ticket from IAD to DTW?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: My trip dates will be Oct 19th to Oct 21st.

ASSISTANT: Do you need any break?

USER: I prefer a connecting flight.

ASSISTANT: May I know your name?

USER: I am Donald Scott.

ASSISTANT: Is there any other specifications?

USER: My depart time should be in the afternoon.

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

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.