You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please let me know your name?

USER: Edward Evans here.

ASSISTANT: Nice name Evans, how may I help you?

USER: I would like to change my existing reservation, because my seminar was postponed.

ASSISTANT: Ok, please wait a while, I will check the existing reservation.

USER: Ok.

ASSISTANT: Sorry to inform you Evans, there is no reservation found with your name in our database.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching our services.

USER: Thank you for your quick response.

ASSISTANT: You are welcome.