You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Davis.

ASSISTANT: How can I assist you?

USER: I am planning to change my reservation due to some issues, can you help me?

ASSISTANT: Raymond Davis, can you give me a moment to check?

USER: Sure.

ASSISTANT: Sorry Raymond Davis, no reservation was found under your name.

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

ASSISTANT: Thank you for consulting our agency. Most welcome.