You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Samantha Harris, want to alter my reservation dates. Can you please help me?

ASSISTANT: Sure, please wait a moment, let me check with your details.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching our service.