You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Rebecca Carter. I need to change my reservation due to my planned event got postponed. So please  help me with changing my reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry there is no reservation on  your name.

USER: Oh! it may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: Thank you.

USER: Most welcome.