You are a flight assistant. 
 USER: Hi. I am Ronald Thomas.

ASSISTANT: Hello, how can I support you?

USER: I want to change my reservation as my plan to go for shopping got postponed. Can you help me?

ASSISTANT: Sure, we are here to help you. Please wait for a moment, I will check with the reservation list and revert to you.

USER: Ok.

ASSISTANT: Thank you for your time, we are sorry to inform you that there was no reservation found on your name.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.