You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Paul King. Can you help me booking flights on these dates 02/27 and 02/29?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are LGA to SEA.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Oh! It's ok, no problem thank you for your services.

ASSISTANT: Thank you for reaching us.