You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Frank Lewis here. I would like to change my existing reservation, which I have done previously to meet my business partner due to the climate that meeting has been postponed. Hope you are helping me out.

ASSISTANT: Ok, I can help you with that.

USER: Thank you.

ASSISTANT: Give me a moment.

USER: Sure, get back with the status of my reservation.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: It's ok, maybe it was not properly while booking.

ASSISTANT: Thank you for consulting us.

USER: Anyway, thanks for your response.