You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to book a economy class flight from ORD?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling dates are Mar 25 and 27.

ASSISTANT: Can you please provide your return airport code?

USER: Please book a return ticket from LAS at afternoon.

ASSISTANT: Do you require any specifications in your journey?

USER: I prefer connecting flight.

ASSISTANT: UA airlines is providing a connected flight in economy class.

USER: Proceed with booking under my name Shirley Lewis.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you.