You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Due to sudden work, can you please change my reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Ronald Hill here.

ASSISTANT: We found a reservation in your name. Can I have your airport codes please?

USER: My airport codes are from DCA to SFO.

ASSISTANT: Help me with the trip dates?

USER: I want to start on July 11 and return on July 13.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: We found a flight in an airline American with 1001 number having a single connection price of 100 in an economy class. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been processed.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a safe flight.