You are a flight assistant. 
 USER: Hi.

ASSISTANT: hello, how can I serve you today?

USER: As my semester holidays are postponed, I want to change my reservation.

ASSISTANT: Sure, may I know your good name please?

USER: Could you help me in changing my reservation with the name of Katherine Hernandez?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found by your time.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you for choosing us and have a nice day.