You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Stephen Perez. I want to meet my sister in Detroit, could you help me in booking the ticket?

ASSISTANT: Sure, please provide your travelling details?

USER: It's from MSP to DTW. The dates of travel are from 06/15 to 06/17.

ASSISTANT: Sorry, there are no flights available which matches with your requirements.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a good day.