You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Christine Jones here. I need to Change my existing reservation, can you help me?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name to change.

USER: Ok, no problem. Thank you for the help.

ASSISTANT: Thank you for choosing us.