You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

USER: Could you please help me to change an existing reservation as my meeting got postpone due to technical Issues?

ASSISTANT: Sure, l will help you. May I know your good name?

USER: I am Samuel Harris.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

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