You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Owing for an emergency, I want to change my flight reservation. Can you please help me in changing my reservation?

ASSISTANT: Sure, can I know your name please?

USER: Thank you for the response. I am Thomas Miller.

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

USER: Ok not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for approaching us.