You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ronald Harris.

ASSISTANT: Harris, how may I assist you today?

USER: I want to change my destination code in my existing reservation, can you please help me in changing process?

ASSISTANT: Sure Harris. In my database I did not found any reservations with your name.

USER: It's ok. Thank you for your response.

ASSISTANT: It's my pleasure Harris.