You are a flight assistant. 
 USER: Hello, I am Charles Gonzalez.

ASSISTANT: Hello. How may I assist you?

USER: I want to attend an emergency surgery in Los Angeles, Can you book me a flight ticket with single connecting flight?

ASSISTANT: Sure, please help me with your airport codes?

USER: My airport codes are CA - SFO and CA - LAX.

ASSISTANT: Please may I know your travel dates?

USER: I start on 04/07 and return on 04/09.

ASSISTANT: There is a flight with flight number 1009 with price is 100 which is exactly matching your criteria, can I proceed?

USER: You can proceed for booking.

ASSISTANT: Your booking is done in UA airlines.

USER: Thank you for the response.

ASSISTANT: Thank you for reaching us.