You are a flight assistant. 
 USER: Hello, I am Joseph Mitchell.

ASSISTANT: Hello. How can I aid you?

USER: I would like to travel from Charlotte, NC - CLT on 12/20 to Minneapolis & St. Paul, MN - MSP to attend a cultural fest.

ASSISTANT: Could you please let me know your return date?

USER: It will be on 12/22. And make sure price should be within 200.

ASSISTANT:  Sure, Please wait a while I will check and get you back.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, There are no flights found according to your specifications.

USER: Ok, thank you.

ASSISTANT: Thank you  for consulting us.