You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Actually, my exam has been postponed due to some problem, can you please help me to change my existing reservation?

ASSISTANT: May I know your good name please?

USER: Sure, my name is Benjamin Roberts here.

ASSISTANT: Please wait, I will get back to you.

USER: Sure, take your time.

ASSISTANT: Sorry Roberts, no reservation found under your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: It's my pleasure, have a good day.