You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my existing reservation, can you please help me?

ASSISTANT: Sure, will you please let me know your name?

USER: Steven Martin.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.