You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please help me to change my existing reservation due to postpone of my exams?

ASSISTANT: Sure, may I know your name?

USER: My name is Amanda Scott.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for choosing us.