You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me to make some changes in my existing reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check availability of your reservation?

USER: My name is Karen Gonzalez.

ASSISTANT: Ok, please wait a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Karen Gonzalez, no reservation has found under your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.