You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I assist you today?

USER: I am Timothy Davis. Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Timothy Davis, there is no reservation found under your name.

USER: No problem, thanks for the information.

ASSISTANT: You are welcome. Thank you for contacting us.