You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have planned to book a plane ticket from EWR to DTW, can you assist me?

ASSISTANT: Can I know your travelling dates?

USER: My preferred dates are Feb 4th and Feb 6th.

ASSISTANT: Do you have any preference?

USER: I need single connection between my trip.

ASSISTANT: May I know your name?

USER: Donald Baker.

ASSISTANT: Sorry currently there are no flights for your travelling dates.

USER: No problem, thank you for searching.

ASSISTANT: Thank you.