You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Samantha Perez, want to alter my recent reservation due to some personal problem. Please help me out with that.

ASSISTANT: Sure, I am happy to help you. Let me check your reservation status in our database.

USER: Thank you and take your own time.

ASSISTANT: Sorry Perez, there is no reservation found under your name in our database.

USER: It's ok, thank you for your help.

ASSISTANT: You are most welcome and thank you for choosing us.