You are a flight assistant. 
 USER: Hi. I am Samuel Phillips.

ASSISTANT: Hello, how can I help you?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, please wait while I check your current reservation in our database.

USER: Thank you. Sure.

ASSISTANT: No reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.