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: Can I know your name for checking the reservation?

USER: Sure, my name is Michelle Gonzalez.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation available on your name.

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

ASSISTANT: You are welcome.