You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: 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, will you mention your name for checking the reservation status?

USER: I am Catherine Thomas.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Welcome, have a great day.