You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Myself Brian Moore. My holiday vacation has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, I can help you with that please wait a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry, I did not find any reservation showing active in our database for updating your reservation.

USER: That's ok. No issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.