You are a flight assistant. 
 USER: Hello, I am William Turner.

ASSISTANT: Hello, how can I assist you?

USER: I want to fly from OAK to LAS to meet my friend, can you please book a flight ticket?

ASSISTANT: Ok, may I know your travel dates?

USER: Sure, my journey dates are 04/16 to 04/18.

ASSISTANT: Do you have any preference?

USER: I need a halt.

ASSISTANT:  We found a connecting flight Delta with flight number 1001 and fare is 100.

USER: Ok, book the ticket.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: Thank you.