You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Nicholas Evans and I just want to change an existing reservation due to my robotic internship got post pone.

ASSISTANT: Sure Nicholas Evans. Please wait for a while, I will check and inform you.

USER: Sure.

ASSISTANT: Unfortunately, we did not find any reservation on your name.

USER: Ok, no issue.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.

ASSISTANT: Have a nice day.