You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am Michelle White. I want to change my existing reservation as my trip got postponed. Please help me out.

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Ok, take your time.

ASSISTANT:  I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: No issues, thank you.

ASSISTANT: Thank you for picking us.