You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Barbara Jones. My holiday trip has been postponed. So, I would like to change my reservation.

ASSISTANT: Sure, I will definitely help you. Jones, I haven't found your previous reservation in our portal. Thank you for opting us, have a great day.

USER: Ok, no issues. Thank you for checking.