You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Could you please book a flight ticket from DTW to EWR?

ASSISTANT: Please provide your travelling dates.

USER: My travelling dates are Dec 17 and Dec 19.

ASSISTANT: Do you have any preference?

USER: I want to depart in the morning.

ASSISTANT: Do you have connection preference?

USER: I need a single connecting flight.

ASSISTANT: Can I know your name?

USER: I am Margaret Martin.

ASSISTANT: Sorry, there is no flight with your requirement.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you.