You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Samantha Perez. As my friend planned for a tour unfortunately my friend met with an accident so our tour got postponed, help me in changing my recent reservation.

ASSISTANT: Sure, give me a minute, let me check reservation list and get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name in our reservation list.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.