You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight for my round trip, can you help me with this?

ASSISTANT: Sure, could you please help me in knowing the airport codes?

USER: Ok, my one and only airport for my round trip is Los Angeles, CA - LAX.

ASSISTANT: May I know your dates when you are travelling?

USER: Sure, 12/30 is my depart date and 01/01 is my return date.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to tell that there are no flights found on your requested dates.

USER: Ok, That's not a problem. Anyway thanks for the information.

ASSISTANT: Thank you for approaching us. May I know your name?

USER: Ashley Evans is my name.