You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: I am Raymond Smith. Please help me to change my active reservation as my meeting was changed.

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.