You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Margaret Harris.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am willing to depart on Oct 29 and return on Oct 31.

ASSISTANT: Do you want to prefer any class?

USER: I am comfortable in any class.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.