You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am looking for a flight on Aug 20 to visit Las Vegas. Can you book a flight for me?

ASSISTANT: When you are willing to travel?

USER: I will return on Aug 22.

ASSISTANT: Can you help me with your airport codes?

USER: My source point is SFO and my destination is LAS.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: May, I know your good name?

USER: My name is Debra Taylor.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.