You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anderson Hill.

ASSISTANT: Hill, how may I guide you?

USER: I am planning to change an existing reservation, due to some urgent work. Can you please change my reservation?

ASSISTANT: Sure, I am here to help you with that. Let me check your reservation status in our database.

USER: Thank you.

ASSISTANT: Hill, sorry for inconvenience no reservation is found on your name in our database.

USER: That's fine. Thank you for your service.

ASSISTANT: you are most welcome, thank you Hill for contacting us.