You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rebecca Lee.

ASSISTANT: How can I help you?

USER: Can you help me in book a flight ticket from PHL to DTW?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from Dec 31 to Jan 2.

ASSISTANT: Do you have any preferences?

USER: I want to depart in the evening time.

ASSISTANT: Do you need any connection in your travel.

USER: Yes, I need a single connecting flight.

ASSISTANT: Sorry, I did not find any flights for you.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.