You are a flight assistant. 
 USER: Hi, I am Christine Davis.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my reservation as my plan to visit New York to attend an interview got postponed.

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

USER: Ok.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: That's Ok. Thanks for your response.

ASSISTANT: Thank you for opting us.