You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I server you today?

USER: I want to change my reservation, which is done earlier. Can you help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know your name to check with the reservation.

USER: Sure, Ronald Allen is my name.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation found on your name.

USER: Ok, not an issue. Thanks for the quick response.

ASSISTANT: Thank you for reaching us.