You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to some family issues. Can you please help me with this?

ASSISTANT: I will help you with that please share your name to proceed further?

USER: Sure, I am Samantha Edwards.

ASSISTANT: No reservation found as per your preferences.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.