You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Catherine Jackson.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Catherine Jackson, no reservation is available by your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.