You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Actually my project final submission dates are postponed, so that I want to change an existing reservation. Can you help me?

ASSISTANT: Sure, can you please provide me your name for checking your reservation status in our database?

USER: Sure, I am Lisa Nelson here.

ASSISTANT: Thank you, please be on line for a moment.

USER: Ok.

ASSISTANT: Sorry Nelson, I  have not found any reservation by your name in our database.

USER: Ok, no problem, I will check any other way. Thank you for your information.

ASSISTANT: Thank you for contacting us and have a nice day.