You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to alter my recent reservation, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Myself Robert Campbell.

ASSISTANT: Please wait for a while.

USER: Sure, I will be waiting.

ASSISTANT: Sorry Robert Campbell, no reservation is available by your name.

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for approaching us.