You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to meet my brother on his birthday, so please book my ticket from LAS to ORD.

ASSISTANT: Your travelling dates please?

USER: My itinerary dates are Dec 18 and 20.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any specifications?

USER: No.

ASSISTANT: There is a flight with single connection in American airlines, can I proceed for booking in 1015 flight?

USER: Book the ticket on the name of Shirley Evans.

ASSISTANT: Your booking is done in economy class.

USER: Thank you for assisting me.

ASSISTANT: Thank you for choosing us.