You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Paul Williams. I want to book a ticket from LGA to DTW. Could you help me in booking?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My preferable dates are from 01/30 to 02/01.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a halt.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you.