You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am George Nelson. I planned to meet my cousin in MSP, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I prefer to travel on Feb 9 and Feb 11.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.