You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Jeffrey Martin. I am planning to visit OEK to meet my sister, can you please find a flight from SEA?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My planning dates are from 07/01 till 07/03.

ASSISTANT: Please send your correct destination airport cod.?

USER: My destination airport code is OAK.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.