You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Jack Martinez, can you help me to book a flight from EWR to DTW?

ASSISTANT: Sure, can you please share your travel dates?

USER: My trip dates are June 12 and 14.

ASSISTANT: Do you have any class preference?

USER: I need a direct flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I want to depart at afternoon.

ASSISTANT: Jack Martinez, I am sorry to inform you that there is no flight available at your request.

USER: No issues, thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching us.