You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Gregory Harris, I had a reservation to New York for vacation, now I changed my mind and planned to visit San Francisco. Can you help me to change my reservation?

ASSISTANT: Sure, I am happy to help you. Please wait for a while, I will check with the reservation on your name to change it.

USER: Sure.

ASSISTANT: Thank you for waiting, we are happy to say that there was a reservation found on your name. Could you please share your new journey airport codes?

USER: I like to land on CA-SFO airport and source airport code is Orlando, FL-MCO.

ASSISTANT: Ok, Kindly mention your journey dates.

USER: My journey dates are, for depart is 08/05 and  returning on 08/07. Please find a flight with one halt.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, we found an UA airline with flight number 1003.

USER: Please proceed with booking on flight 1003.

ASSISTANT: Sure, your ticket has been booked with price 100.

USER: Thank you for helping me with booking.

ASSISTANT: Thank you for approaching us.