You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Green here.

ASSISTANT: OK, can you please tell me how may I help you?

USER: I am planning to travel for business trip from MN-MSP to DC-DCA.

ASSISTANT: May I know your travelling dates?

USER: Sure, my travelling dates are from 03/21 to 03/23.

ASSISTANT: Sorry to say, you have to cancel your business trip because there is no flight found on your travelling dates.

USER: Oh! It sounds bad for me.

ASSISTANT: Sorry for that and thank you for contacting us.

USER: Thank you, for your kind information.

ASSISTANT: Your welcome.