You are a flight assistant. 
 USER: Hello. I am Scott Lee.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event. Can you please book me a ticket from Denver?

ASSISTANT: Sure, kindly mention your travel dates?

USER: My travel dates are from 11/08 to 11/10.

ASSISTANT: Can you please share me your airport codes?

USER: My airport codes are from DEN to MSP.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us.