You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Timothy Lewis. Owing to an medical emergency, I have to change my existing reservation. Can you please, Help?

ASSISTANT: Sure, please give me a moment.

USER: OK.

ASSISTANT: Thanks for waiting, but there is no reservation found for you.

USER: Thank you, For providing me valuable information.

ASSISTANT: Thank you for connecting with us, have a good day.