You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah White.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from DCA to MSP, can you please help me out?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My planning dates are from 12/09 till 12/11.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, I will choose any other way to reach my destination on time. Anyway thank you for checking.

ASSISTANT: Welcome, have a safe flight. Thank you for choosing us.