You are a flight assistant. 
 USER: Hello. My name is Nancy Phillips.

ASSISTANT: Hello, how may I aid you for the day?

USER: I would like to travel from DCA to MSP, could you help me out?

ASSISTANT: Sure, we are here to help you. Can you please share your travel dates?

USER: My preferable date are from 22-24 AUG.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok. Thank you.

ASSISTANT: Thank you.