You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Katherine Jones.

ASSISTANT: Hello Jones, what should I do for you?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Katherine Jones, no reservation found on your name.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thank you for approaching us, have a cheerful day.