You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Edward Hernandez. I want to book a ticket from MSP to PHL. Could you please help me?

ASSISTANT: May I know your desired travel dates please?

USER: My preferable dates are from 02/11 to 02/13.

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

USER: That's ok no problem. Thank you for helping me.

ASSISTANT: Thank you for your opting us.