You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to some health issues I could not catch my flight at right time, so I need some help to change my existing reservation. Will you help me in changing?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Elizabeth Davis.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: No problem, thanks for your support.

ASSISTANT: Thanks for approaching us.