You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Charles Lewis, I want to change my reservation as my plan to visit Houston for short vacation is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, we are help to you. Please wait a moment, I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform you that there were no reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for the reaching us.