You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, we are here to support you.

USER: Thank you.

ASSISTANT: Please share your good name?

USER: My name is Stephen Martin.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

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

ASSISTANT: Thank you.