You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa King.

ASSISTANT:  Melissa King. How may I help you?

USER: I have made an earlier reservation to attend for a seminar, due to some issues my seminar has been postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure Melissa King, just give me moment.

USER: Sure.

ASSISTANT:  Melissa King, Sorry to inform that there is no reservation by the name  Melissa King.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.