You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Rebecca Wright.

ASSISTANT: How can I support you Rebecca?

USER: Could you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Its ok, thank you for the information.

ASSISTANT: It's my pleasure, have a great day.