You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to change my reservation? Because I have some work on that dates.

ASSISTANT: Sure, I will help you. Can I know your good name?

USER: My name is Karen Harris.

ASSISTANT: Sorry Harris, no reservation found.

USER: Ok, no issues. Thank you for your time.

ASSISTANT: Most welcome.