You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to change my reservation as my meeting with my religious head had been postponed, help me in changing my reservation with the name Melissa Thomas.

ASSISTANT: Sure, please wait a moment, I will check the reservation.

USER: Sure.

ASSISTANT: Melissa, there is no reservation on your name.

USER: Not an issue, I think I have made the reservation in other airline. Thank you for your assistance.

ASSISTANT: Thank you so much.