You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

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

ASSISTANT: Sure, please let me know your name.

USER: My name is Andrew Williams.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, we could not find any reservation active by your name in our list.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.