You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Laura Harris. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, let me check your reservation status in our database.

USER: Ok.

ASSISTANT: Sorry, we couldn't found any reservation in our database.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.