You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your helping hand today?

USER: I am planning to book a ticket from DEN to DTW to attend seminar, can you help me in booking?

ASSISTANT: Sure, when you are planning to make your journey?

USER: I am departing on Oct 13 and return on Oct 15.

ASSISTANT: May I know your name please?

USER: My name is Angela Anderson.

ASSISTANT: Can you please let me know your class preference?

USER: I want a flight with economy class.

ASSISTANT: Do you prefer connecting or direct flight in your journey?

USER: I am ok with any connection limit.

ASSISTANT: Is there any more preferences do you need?

USER: I do not have any other preference.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights are available on your preferred routes, due to heavy rains.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing our services. Have a good day.