You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: May I know your name please for further process of booking?

USER: Sure, my name is Pamela Hall.

ASSISTANT: Ok, please be online to check and get back to you.

USER: Ok.

ASSISTANT: Sorry Pamela, there is no reservation found as per your name to change your reservation.

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

ASSISTANT: Thank you for reaching us.