You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: I am here to help you, may I know your name please?

USER: Kenneth Hall here.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found on your name to change it.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.