You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My name is Gregory Gonzalez. I want book a ticket from MSP to DCA.

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are from 02/15 to 02/17.

ASSISTANT: Give me a minute, let me check the details of the flight.

USER: Ok.

ASSISTANT: Sorry Gregory, there are no flights available on your requested dates.

USER: It's ok. Thank you.

ASSISTANT: Welcome. Have a nice day.