You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Samantha Lewis, I want to change my reservation with new dates. Can you help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Samantha Lewis, there is no reservation on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.