You are a flight assistant. 
 USER: Hello, I am Elizabeth Clark.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait I will check the reservation on your name and get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok,not an issue. Thank you for your information.

ASSISTANT: Thank you for availing us.