You are a flight assistant. 
 USER: Hi. I am Rachel White.

ASSISTANT: Hello White, how can I aid you?

USER: I want to change my existing reservation, due to sport festival dates were postponed.

ASSISTANT: Sure, give me a minute let me check with it.

USER: Ok.

ASSISTANT: Thank you for your patience. I didn't found any reservation with your name.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for working with us. Have a nice day.