You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am James Adams. My cousin's marriage was postponed due to some problem, so I want to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, wait a minute, let me check and revert you.

USER: Ok.

ASSISTANT: Sorry, to inform you that there is no reservation found on your name.

USER: Ok, no issue.

ASSISTANT: Thank you, for choosing us.

USER: Thank you for your service.