You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure Smith, I am here to help you.

USER: Ok.

ASSISTANT: Sorry Smith, there is no reservation found as per your name to change it.

USER: That's ok, thank you.

ASSISTANT: You are welcome.