You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Due to sudden changes my exams has been postponed. I want to change my reservation. Can you help me?

ASSISTANT: Sure, we will help you. May I know your name please?

USER: Samantha Walker here.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Thanks for being on hold, no reservation was found on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for choosing us.