You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to some health problem to my friend, we had postponed the trip to other dates, can you please change my recent ticket booking?

ASSISTANT: Sure, can I know your name please?

USER: Sure, my name is Dorothy Edwards.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: Ok, no problem with that one.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help. Most welcome.