You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, may I know your name for checking?

USER: I am Paul Lopez.

ASSISTANT: Give me a minute for checking.

USER: OK.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.