You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Steven Wright. I would like to book a flight ticket to Seattle, to participate in the swimming with my colleagues from San Francisco. Could you please help me for booking a flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: I have to travel on 05/31 and return on 06/02.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are CA-SFO and WA-SEA.

ASSISTANT: Do you have any specifications?

USER: I need a single connection limit. Price limit should be under 200.

ASSISTANT: Please wait for while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to say that we have not found any flights with your given details.

USER: Thank you for your assistance.

ASSISTANT: Thanks for choosing us.