You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Patricia Collins here. I want to book a flight ticket from BOS to MSP. Can you help me in that?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are May 18 to May 20.

ASSISTANT: Do you have any specifications?

USER: I need halt in between journey.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you.