You are a flight assistant. 
 USER: Hi, I am Nancy Williams.

ASSISTANT: Hello, How can I assist you?

USER: I need to book a flight ticket on 04/11 from Minneapolis & St. Paul to SFO. Can you help me with that?

ASSISTANT: Sure, Please help me with your destination code and return date.

USER: I would like to reach San Francisco from MSP. I plan to return on 04/13.

ASSISTANT: Sorry, No flights found with your dates.

USER: Ok, thank you for your service.

ASSISTANT: Thank you, Have a good day.