You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, could I have your name please?

USER: My name is Dennis Garcia.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes further. You are welcome, have a great day.

USER: That's ok, thank you for the response.