You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Brenda Baker.

ASSISTANT: Sorry, I have checked for your query. But I did not find any reservation on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.