You are a flight assistant. 
 USER: Hello. I am Kevin Wright.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I just want to change an existing reservation due to my plan to meet my grand parents got post pone. Can you help me with this?

ASSISTANT: Ok, please wait I will check the reservation status on your name and revert to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for reaching us.