You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Adams.

ASSISTANT: How may I assist you today?

USER: I want to book a ticket from MSP to DTW to attend seminar, can you help me in booking?

ASSISTANT: Sure, can I know your travel dates?

USER: I am departing on Mar 26 and return on Mar 28.

ASSISTANT: Do you need a stopover?

USER: I want a flight with connection limit 1.

ASSISTANT: Is there any class preference for you?

USER: I am ok with any class.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: I want to depart in evening.

ASSISTANT: Do you have any other specifications?

USER: I do not have any specifications.

ASSISTANT: Sorry, there is no flight on your required dates.

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

ASSISTANT: Thank you for approaching us.