You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from LAS to DTW. Could you book a ticket?

ASSISTANT: Please provide your trip dates.

USER: Departure date is Aug, 26 and return by Aug, 28.

ASSISTANT: Do you need any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Are there any other specifications?

USER: I would like to depart in the evening.

ASSISTANT: May I know your name?

USER: My name is Catherine Adams.

ASSISTANT: There are no flights available on your routes.

USER: Thanks.

ASSISTANT: Thank you for choosing us.