You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you book a flight ticket for me from DTW to JFK?

ASSISTANT: What can I do for you?

USER: I need some help in that booking, please help me.

ASSISTANT: Sure, can you please tell me your planned travel dates?

USER: My travelling dates are on 10/14 and back on 10/16 with a direct flight.

ASSISTANT: Ok, may I know your name?

USER: My name is Carol Williams.

ASSISTANT: I am sorry to inform you, I have not found any flight in this route on the dates you have provided.

USER: Ok, I will plan some other dates for travelling. Thank you for your information.

ASSISTANT: You are most welcome. Thank you for choosing us.