You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michael Brown.

ASSISTANT: How may I help you today?

USER: I have reserved a ticket last week to attend a summit regarding women entrepreneurship but suddenly it got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: No, I remember when I have done my reservation so check once again for that.

ASSISTANT: I have confirmed with my higher authorities, but due to some technical issues your ticket has not booked properly.

USER: Oh! I will check my mail once again and I will contact you if there is any concerns. Anyway, thank you for your time.

ASSISTANT: Ok, thank you for reaching us.

USER: Most welcome.