You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Nicole Brown. I want to book a flight ticket to attend my friend wedding in Washington, could you help me in booking a flight ticket?

ASSISTANT: Sure, please share me your travel dates.

USER: I would like to fly on 02/01 and return on 02/03.

ASSISTANT: Can I have your airport codes?

USER: My source is Minneapolis, MN - MSP and destination code is DC - DCA.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Not an issue. Thank you.

ASSISTANT: Have a good day.