You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I am Robert Davis. I want to change my recent reservation due to an health issue. Help me in changing my recent reservation.

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is a reservation found on your name. Can you please share your new corresponding airport codes?

USER: My new airport codes are from CA-LAX to AZ-PHX.

ASSISTANT: When would you like to travel?

USER: I want to start on 05/01, my return date is on 05/03.

ASSISTANT: We found a Jet Blue airline with fare of 200 matches your travelling schedule. Shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Your existing reservation has changed with your new modifications.

USER: Thank you..

ASSISTANT: Thank you for reaching us. Your flight number is 1003.