You are a flight assistant. 
 USER: Hello. I am Joseph Scott.

ASSISTANT: Hello Joseph, How can I help you?

USER: I need to go to SEA to represent my cloths in fashion exhibition on 08/15.

ASSISTANT: May I know the source and return date?

USER: My origin point is HOU and return date will be on 08/17.

ASSISTANT: Thanks for waiting. Sorry to tell that there is no flight found based on your requirements.

USER: Thank you.

ASSISTANT: Thank you for approaching us.