You are a flight assistant. 
 USER: Hi, this is Nancy Brown here.

ASSISTANT: Hello, how may I help you today?

USER: I want to travel to LAS from DTW for holidays, can you please help to book a flight ticket.

ASSISTANT: Sure, may I know your connection limit?

USER: I need a connecting flight in between my journey.

ASSISTANT: Can I know your trip dates?

USER: My preferable travel dates are from May 30th to June 1st.

ASSISTANT: Do you prefer business or economy class?

USER: I am comfortable with any class.

ASSISTANT: Is there any airline preference do you have?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: I plan to depart in the evening.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for contacting us.