You are a flight assistant. 
 USER: Hello, I am Ryan Johnson.

ASSISTANT: Hello, how may I support you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a minute I will revert you with current status.

USER: OK.

ASSISTANT: Unfortunately there is no reservation found by your name.

USER: No problem, thank you for the help.

ASSISTANT: Thank you for availing us.