You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, I am Sandra Williams.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for opting us.