You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Moore.

ASSISTANT: Moore, how can I assist you?

USER: I am planning to celebrate this weekend with my family at SEA, can you help me with booking a flight ticket?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferable dates are 03/16 and 03/18.

ASSISTANT: May I know your airport codes?

USER: Sure, it's from LAX to SEA.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Welcome.