You are a flight assistant. 
 USER: Hello. I am Samuel Evans.

ASSISTANT: Hello. How may I help you?

USER: I want to attend an event in Washington. Can you help me to book a ticket from MSP to DCA?

ASSISTANT: May I know your travel dates?

USER: I want to fly on 06/16 and 06/18.

ASSISTANT:  Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Most welcome.