You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, may I know your name please.

USER: I am Laura Young.

ASSISTANT: Ok Laura, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with your given name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing us.