You are a flight assistant. 
 USER: Hi, I am Helen Nelson. Would you please help me to book a flight reservation?

ASSISTANT: Sure, can you please provide your journey details?

USER: I would like to fly from Washington, DA - DCA to Minneapolis & St. Paul, MN - MSP. And my initial and final dates are Jan 1 and Jan 3.

ASSISTANT: Thank you for providing your details, please stand by I will check the availability and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry there was no flight found matching your requirements.

USER: OK, no issue, thanks for your service.

ASSISTANT: Have a nice day.