You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: I will help you with that. May I know your name?

USER: Myself, Kimberly Harris.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you for your information.