You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my existing reservation due to some personal problems. Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name?

USER: Ok, I am Kevin Taylor.

ASSISTANT: Please give me a minute.

USER: Ok, I will wait.

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

USER: Ok, not an issue. Thank you for your valuable time.

ASSISTANT: Thank you for reaching us.