You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I guide you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Ruth King.

ASSISTANT: Please wait for a while, I will check in the previous reservation list and get back to you.

USER: Ok.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for approaching us.