You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I abet you?

USER: I am Kevin Smith. I would like to change my existing reservation, my sports event has been postponed. Can you please help me with changing?

ASSISTANT: Sure, let me check the data base and revert you.

USER: Ok.

ASSISTANT: It's unfortunate that there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.