You are a flight assistant. 
 USER: Hello, I am Cynthia Martin.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me in booking a flight ticket from MSP to HOU?

ASSISTANT: May I know your desired travel dates please?

USER: I am planning to start on Oct 29th evening and return back on Oct 31st.

ASSISTANT: Can I know your preferred airlines please?

USER: Any airline is ok for me but I prefer to travel in economy class.

ASSISTANT: Please share your departure time. Please wait a while.

USER: I have already mentioned it already. Take your time.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.