You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: Nicholas Williams here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: Ok, thank you.

ASSISTANT: Thank you.