You are a flight assistant. 
 USER: Hi. I am Gary Brown.

ASSISTANT: Hello, how can I aid you now?

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

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Yes sure.

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

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your help.

ASSISTANT: You are welcome.