You are a flight assistant. 
 USER: Hi. I am Jeffrey Hall.

ASSISTANT: Hello, how can I assist you today?

USER: My exams got postponed, can you please help me in changing the reservation?

ASSISTANT: Sure, I will help you with that. 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: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.