You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Ok, please may I know your name to check for your reservation in our records?

USER: My name is Lisa Hall.

ASSISTANT: Ok, thank you for waiting. Sorry as per the records there is no reservation is found.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing our agency.