You are a flight assistant. 
 USER: Hello. I am Dennis Walker.

ASSISTANT: Hello, how may I support you today?

USER: I am planning to shoot documentary on the most haunted place Harvard Exit Theatre. Can you book me a ticket in business class to reach there?

ASSISTANT: Sure, can you provide your airport codes?

USER: My origin is AUS and destination is DTW.

ASSISTANT: Let me know your travel dates please?

USER: I would start on Aug 19th and return on Aug 21st.

ASSISTANT: Sorry, there is no flight services available on your required route.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for approaching us.