You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Nancy Wilson.

ASSISTANT: Nancy Wilson. How can I help you?

USER: I want to book a direct flight from Austin for vacation. Can you help me with booking?

ASSISTANT: Sure, can I  have your genesis and terminus codes?

USER: My source point is AUS and my destination is ORD.

ASSISTANT: Please provide me with the travel dates?

USER: I like to travel on Feb 21 and return on Feb 23.

ASSISTANT: Would you care for any class preferences?

USER: No.

ASSISTANT: Is there any time concern?

USER: I want my departure flight in afternoon and return flight in evening.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform that there are no flights on your desired dates.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us.