You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Ronald Thompson. I want to change my existing reservation as my interview got postponed. Please help me out.

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for your time, sorry, no reservation found with provided name.

USER: No issues, thanks for the information.

ASSISTANT: Thank you for approaching us.