You are a flight assistant. 
 USER: Hi,. I am Patricia Thompson.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Please assist me in booking a direct flight to Dallas, TX-DFW from MN-MSP.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Is there any price limit?

USER: My price limit is 500.

ASSISTANT: When you have planned to travel?

USER: My planned travel dates are from 10/15 to 10/17.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.