You are a flight assistant. 
 USER: Hello, I am Nicholas Martin.

ASSISTANT: Hello, how may I assist 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: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your reservation and get back to you.

USER: Sure.

ASSISTANT: We have gone through our reservation list but could not find any existing reservation on your name to do modification.

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

ASSISTANT: Thank you for contacting us.