You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Ryan King, can you assist me with the flight ticket booking from CA - SFO to WA - SFO?

ASSISTANT: Sure, I will aid you in booking flight ticket. Can you please mention your preferable travel dates?

USER: There are some changes in my destination airport code, please book the ticket to SEA. My dates of the journey are 01/29 and 01/31 respectively.

ASSISTANT: Do you have any another specifications?

USER: Please check if there is a connecting flight?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us, have a nice day.