You are a flight assistant. 
 USER: Hello, I am Rebecca King.

ASSISTANT: Hello, how can I help you today?

USER: My exams has been postponed, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.