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

ASSISTANT: Hello, how can I aid you today?

USER: I need to change my recent reservation due to postpone of my documents verification. Could you please help me?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.