You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I have to change my flight ticket reservation done in the last week, can you please help me in changing my flight ticket?

ASSISTANT: Sure, can I know your name please?

USER: Sure, my name is Jerry Adams.

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

USER: Ok, that's fine. Thank you for your information.

ASSISTANT: Thank you for approaching us.