You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best I can serve you at this moment?

USER: Please check once if any active reservation are there with my name. If you found any reservation then modify dates.

ASSISTANT: Sure, that is what I am here.

USER: Thank you.

ASSISTANT: On what name you have made a reservation earlier?

USER: I made a reservation on the name of Nicholas Taylor.

ASSISTANT: Thanks for providing your name, please wait a minute I will check in the previous list in our system database and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry , we regret to inform you that there is no active reservation found on your name to change.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for approaching us, hope to serve you better next time.