You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Owning to an emergency 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: Jerry Hall here.

ASSISTANT: There is no reservation found under your name.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.