You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How may I help you?

USER: I am Brandon Thomas. I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: No reservation found for changing reservation.

USER: Ok, no issues.

ASSISTANT: Thanks.