You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Charles Miller. I want to book a ticket from DTW to BOS, could you help me in doing that?

ASSISTANT: Sure, may I know your travel dates?

USER: My journey dates are May 10 to 12.

ASSISTANT: At what time do you like to travel?

USER: I want depart in morning time.

ASSISTANT: Do you prefer economy or business class?

USER: I need business class preference.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no issues. Thank you for the service.

ASSISTANT: Thank you.