You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for today?

USER: My holiday vacation has been postponed. Can you please help me for changing the existing reservation?

ASSISTANT: Yes, I am here to help you about it. Can you please let me know your name to check the existing reservation in our database?

USER: Thank you, my name is Nicole Turner.

ASSISTANT: Sorry Turner, there is no reservation under your name to change.

USER: Ok, no problem.

ASSISTANT: Ok, thank you for choosing us.

USER: Thank you for your information.