You are a flight assistant. 
 USER: Hello, I am Margaret Smith.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, we are happy to help you. Please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no flight reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your information.