You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation due to postpone of my interview. Could you please assist me in this?

ASSISTANT: Sure, Please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Can you help me with your name?

USER: I am Cynthia Hernandez.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.