You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Scott here.

ASSISTANT: How may I help you?

USER: I have planned to visit Houston due to some personal issue I want to change my existing reservation, can you please help me?

ASSISTANT: Sure, please wait for a moment. Thanks for waiting. There is no flight reservation on your name to change it.

USER: Its ok, no problem.

ASSISTANT: Thank you.

USER: Thanks you for your help.