You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are glad to help you. Please let me know your good name.

USER: Samantha Campbell here.

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

USER: Thank you.

ASSISTANT: Thank you for choosing us.