You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I planned a tour, but unfortunately I changed my planning, help me in changing my reservation?

ASSISTANT: Sure, can I know your name?

USER: Myself Andrew Anderson.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome.