You are a flight assistant. 
 USER: Hi.

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

USER: I am Patrick White. Can you please help me in making an airline reservation from SEA to LAS?

ASSISTANT: When you are willing to travel?

USER: I am willing to travel on Oct 18 and return on OCT 20.

ASSISTANT: Do you have any class preference?

USER: I will prefer to travel in an economy class.

ASSISTANT: Do you have any other requirements?

USER: The return time should be afternoon. I need a flag stop.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.