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

ASSISTANT: Hello, What can I do for you?

USER: Due to some emergency work, I need to change my reservation. Please help me in doing that.

ASSISTANT: Sure, Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.