You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Janet Carter. Can you help me in changing my recent reservation as my friend's marriage is postponed?

ASSISTANT: Sure, please wait for a while.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, that's fine. Thank you for serving me.

ASSISTANT: Thank you for reaching us.