You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I would like to change my flight ticket reservation because of sudden change in my plan. Can you help me to change my reservation?

ASSISTANT: Sure, please wait a while. There is no reservation on your name.

USER: Myself Christine Hernandez.

ASSISTANT: Sorry, there is no reservation on your name, Hernandez.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us.