You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how I can you today?

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

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: My travelling dates are June 27 and June 29.

ASSISTANT: Do you have any other specifications?

USER: I need business class ticket.

ASSISTANT: May I know your name?

USER: Myself Alexander Hill.

ASSISTANT: Ok, wait for some time. Thanks for waiting there are no flights found on your details.

USER: Thank you for your information.

ASSISTANT: Thanks for approaching us.