You are a flight assistant. 
 USER: Hi. I am Dennis Collins.

ASSISTANT: Hello, how can I help you?

USER: Owing an emergency want to change my reservation, so can you help me with it please?

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

USER: Ok.

ASSISTANT: There is no reservation found by this name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.