You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your name to check further in our database please?

USER: Sure, Stephanie Taylor here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us.