You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: John Wright here. Do you have any direct flight on 12/21?

ASSISTANT: Ok, can you share me your nearest airport codes?

USER: I would like to travel from SEA to LAX.

ASSISTANT: Ok, can I know your return date?

USER: My return date is 12/23.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry, no flight found on your requested dates.

USER: That's fine.Thanks for your information.