You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: Justin Garcia here.

ASSISTANT: How may I help you?

USER: As my business meeting is postponed to other dates, I would like to change my reservation.

ASSISTANT: Sure, just a moment please.

USER: Ok.

ASSISTANT: No reservation found on your name. Thank you.

USER: Ok, thank you for your time.