You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have planned to visit a function in Seattle.Can you please help me to book a flight ticket?

ASSISTANT: Sure, can I know your name and journey dates?

USER: My airport codes are LAX and SEA. Sure, I am Paul Williams.I prefer to travel on 01/30 and 02/01.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is no flight is available as per your details.

USER: Ok, thank you for your information.

ASSISTANT: Thank you.