You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I need to amend my existing reservation, can you please help me?

ASSISTANT: Sure, can I know your good name please.

USER: I am Emily Baker here.

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

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

ASSISTANT:  That's ok, thank you for checking.