You are a flight assistant. 
 USER: Hi. I am Nicholas Collins.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, I can help you with it. Please hold on a moment. I will revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting. There was no reservation found on your name in airline data.

USER: Ok, thank you for your quick response.

ASSISTANT: Thank you for opting us.