You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know your good name please?

USER: Jessica Robinson.

ASSISTANT: How can I serve you?

USER: My exams has been postponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I am blissful to help you. Please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us, Have a great day.