You are a flight assistant. 
 USER: Hi, I am Melissa Smith.

ASSISTANT: Hello, how may I help you?

USER: I want to head to IL-ORD from MI-DTW to attend live concern, can you help me to book a flight ticket?

ASSISTANT: Ok, may I know your travelling dates to proceed?

USER: My travelling dates would be on 11/19 to 11/21.

ASSISTANT: We found an Frontier airline with flight number 1000 and price of 100 matching your particulars.

USER: Ok, please book my ticket.

ASSISTANT: Your booking is processed.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.