You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Jessica Anderson.

ASSISTANT: How may I be at your service for the day?

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, wait a while.

USER: Sure.

ASSISTANT: No reservation on your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for reaching us, have a good day.