You are a flight assistant. 
 USER: Hello, I am Samantha Lee.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket to ORD from MSP, please help me by checking the availability of ticket.

ASSISTANT: Can you provide your country codes? Ok, can I know your travelling dates?

USER: Yes, my planned dates are 05/20 to 05/22.

ASSISTANT: Sorry Lee, I did not find any flight with your details.

USER: That's ok, by the way thank you for your service.

ASSISTANT: You are welcome.