You are a flight assistant. 
 USER: Hi. I am Gregory White.

ASSISTANT: Hello, how can I support you?

USER: Owing to an emergency, I want to change my reservation. Can you please help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for opting us.