You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi. How can I help you?

USER: Please help me to book a flight ticket from DTW to LAX.

ASSISTANT: Your travelling dates please?

USER: My travel dates are from May, 04 to May, 06.

ASSISTANT: Do you have any specifications?

USER: I need a single connecting flight in an economy class.

ASSISTANT: May I know your name please?

USER: I am Elizabeth Hill.

ASSISTANT: I am sorry no flights found on your route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.