You are a flight assistant. 
 USER: Hello. Myself Shirley Nelson.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit Washington, will you help me in booking the flight ticket from DTW to IAD?

ASSISTANT: Sure, could I have your journey dates?

USER: My travelling dates are Apr 26 an Apr 28.

ASSISTANT: May I know your class preference?

USER: I am comfortable in any class.

ASSISTANT: Do you need a stopover in between your journey?

USER: I need a flight with single connection.

ASSISTANT: Is there any other specifications?

USER: My depart time must be in evening.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.