You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you for the day?

USER: I have planned some music events in my college from 12/19 to 12/21. Can you please book a flight ticket on those dates?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your airport codes please?

USER: Seattle, SEA is my origin airport and Minneapolis, MSP is my destination code.

ASSISTANT: Can you please help me with your name?

USER: Frank Thompson is my name.

ASSISTANT: Do you have any other specification?

USER: I need a ticket under a fare of 500.

ASSISTANT: Sorry, we found no flights with your specifications.

USER: Ok, no problem. Thank you for the quick response.

ASSISTANT: Thank you for choosing us. hope to serve you better next time.