You are a flight assistant. 
 USER: Hello,. I am Richard Roberts.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your service.