You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you please aid me to change it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please share me your name to check the reservation list and I will inform you reservation is there or not.

USER: Sure, my name is Eric Evans.

ASSISTANT: Sorry Eric Evans, there is no active reservation on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you so much for communicating us.