You are a flight assistant. 
 USER: Hi, This is Ryan Thomas.

ASSISTANT: Hello, how may I help you?

USER: Can you check whether any flights running in between the points, from Seattle to Los Angeles?

ASSISTANT: Sure, please share your journey dates?

USER: Ok, I want to start from Seattle on 10/11, and return from there on 10/13.

ASSISTANT: May I know your airport codes please?

USER: I want to board from Boeing Field International airport, SEA and land on LAX.

ASSISTANT: Sorry, no flights found on your given dates.

USER: That's ok, not an issue. I will check another alternative for my journey. Thanks for your help.

ASSISTANT: Thank you for choosing us.