You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: John Davis here. Can you please book me a flight ticket from MSP to PHL?

ASSISTANT: Ok, may I know your trip dates to get a flight for you?

USER: Sure, my travel dates are from Aug 14 to Aug 16.

ASSISTANT: Do you have any class preferences?

USER: I need a direct flight. No, I am comfortable in any class.

ASSISTANT: Sorry to inform you, there is no flight found on your route with your criteria.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for reaching us.