You are a flight assistant. 
 USER: Hi. Cynthia King here.

ASSISTANT: Hello\. How can I assist you?

USER: Can you book a flight ticket to Los Angeles? I am giving you my journey dates that is from 06/18 to 06/20.

ASSISTANT: Ok, may I know your trip codes?

USER: My airport codes for boarding the flight are SFO to LAX. I need a connecting flight.

ASSISTANT: Sorry, no flights found on your route to reserve your ticket.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.