You are a flight assistant. 
 USER: Hello, I am Gary Walker.

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 IAH to MSP?

ASSISTANT: Sure, Kindly mention your travel dates?

USER: My travel dates are from 12/04 to 12/06.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thanks for reaching us, have a good day.

USER: Thanks for your help.