You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Richard Perez. My business meeting is postponed, so I need your help me to change my existing recent reservation. Can you help me?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Oh, it's ok no problem. Thank you for your information.

ASSISTANT: Thank you.