You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: Angela Clark here.

ASSISTANT: Sorry, no reservation found on your name.

USER: Thank you for the help.

ASSISTANT: Thank you for opting us.