You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I am here to help you. Please wait a moment I will check your complete details and proceed further.

USER: Sure, please check my details.

ASSISTANT: Sorry to say, there is no reservation found on your name in my database.

USER: Ok, no issues with that. Thank you for your information.

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