You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: My name is Karen Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your information.

ASSISTANT: Karen Lopez, there is no active reservation found under your name to do changes in that.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.