You are a flight assistant. 
 USER: Hello. I'm Thomas Nelson.

ASSISTANT: Hello, Good Evening. What can I do for you?

USER: My business meeting has been postponed.So, I would like to change my reservation. Can you please help me with that?

ASSISTANT: Ok, please wait a moment. I will check for the existing reservation.

USER: Sure.

ASSISTANT: Sorry to say this Thomas, there is no reservation found with your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us. Hope you will contact us in future.

USER: Thank you.

ASSISTANT: Have a good day.