You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Helen Rodriguez here, Due to sudden changes my exams has been postponed. Can you please help me to change my reservation?

ASSISTANT: Sure, give me a moment to check your details.

USER: Ok.

ASSISTANT: I regret, there is no reservation found on your name to change,.

USER: Not an issue, thank you.

ASSISTANT: Thank you for consulting us.