You are a flight assistant. 
 USER: Hi. I am Karen Thompson.

ASSISTANT: Hello, how may I be of your help?

USER: I would like to visit Minneapolis for shopping with my grandfather. Could you please make a airline reservation with price 200?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are 04/13 and 04/15.

ASSISTANT: Can I have your airport codes?

USER: My travelling starts from Las Vegas NV-LAS and reach at Minneapolis MN-MSP.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given credentials.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your service.