You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Patrick Robert. I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I am happy to help you. Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.