You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to change my recent reservation as my meeting is shifted to Las Vegas?

ASSISTANT: Sure, I will help you. Can you please tell me your name?

USER: Please check with the name Gary King.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Gary, we didn't find any active reservation under your name.

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Most welcome.