You are a flight assistant. 
 USER: Hi, I am Carol Jackson.

ASSISTANT: Hello, how may I aid you?

USER: Can you book me a direct flight from Las Vegas, NV - LAS to Detroit, MI - DTW as I have an conference at the Cobo Center?

ASSISTANT: Sure, please share your travel dates?

USER: My depart is on 06/21 and arrival is on 06/23.

ASSISTANT: Do you have any price limit?

USER: Yes, it must be under 200.

ASSISTANT: Sorry, there is no direct flight available from your source location.

USER: It's Ok.

ASSISTANT: Thank you for availing us.

USER: Thanks for your assistance.