You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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: Could you let me know your name?

USER: I am Melissa Hall.

ASSISTANT: Sorry, there is no reservation by your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you.