You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Brown here.

ASSISTANT: How can assist you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Ok, sure I am here to help you. Can you please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you reaching us.