You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Rachel Rodriguez here. I would like to change my previous booking due to my office work, can you help me out?

ASSISTANT: Sure Rachael, I will help you with that.

USER: Thank you for your positive response.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok, I will be waiting for your response.

ASSISTANT: Sorry Rachel Rodriguez, no reservation has found under your name to change.

USER: Oh! That's very sad to hear from your side, thank you for checking anyways.

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are most welcome.