You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Patrick Turner.

ASSISTANT: How can I assist you today?

USER: I am planning to attend a my sister's marriage in Las Vegas, Can you help me for booking a flight ticket please?

ASSISTANT: Sure, I need your airport codes for further booking.

USER: My source point is MN-MSP to destination point is NV-LAS.

ASSISTANT: May I know your scheduled dates of travel?

USER: I would like to travel on 03/22 to arrival on 03/24.

ASSISTANT: Thank you for your details. There is no flight found with your dates of travel.

USER: Ok,thanks for your information.

ASSISTANT: Thank you for choosing us. Have a cheerful day.