You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Could you please help me to change my reservation?

ASSISTANT: May I know your name?

USER: My name is Rachel Rodriguez.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.

USER: Ok, not a problem.

ASSISTANT: Welcome Rachel Rodriguez.

USER: Thank you for informing me.