You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you please help me in changing my flight reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Joshua Davis.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, we could not find any reservation on your name.

USER: Not an issue. Thank you for checking.

ASSISTANT: Thank you for approaching us.