You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you please change my existing reservation, due to an emergency?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please, provide me your name to check your reservation status.

USER: My name is Frank Clark.

ASSISTANT: Ok, please wait for a while. I will check with it and get back to you.

USER: Sure.

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

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.