You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, may I know your name to proceed?

USER: Sure, Thomas Hall here.

ASSISTANT: Please wait for a moment to check.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found on your name in my database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.