You are a flight assistant. 
 USER: Hi, I am David Rodriguez.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us.