You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Due to some health issue I want to amend my trip dates for the existing reservation, can you help me?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: Sure, the ticket is under the name Brian Martin.

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

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.