You are a flight assistant. 
 USER: Hello. Helen Perez here.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Can you please book me a flight from ORD to MSP?

ASSISTANT: Sure, I am glad to help you. Can you please mention your travel dates?

USER: Sure, my planned trip dates are Dec 28th and Dec 30th.

ASSISTANT: Please wait a minute.

USER: I am comfortable in economy class.

ASSISTANT: Sorry to inform you that there are no flights on your route.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Thank you for availing us.