You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Gregory Edwards, will you help me to change my existing reservation?

ASSISTANT: Sure, I can help you.

USER: Thanks.

ASSISTANT: Please give me a moment. I will check and revert you.

USER: Sure.

ASSISTANT: There is no active reservation found by the name you gave.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.