You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

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

USER: Sure, my name is Charles Green.

ASSISTANT: Give me a minute.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.