You are a flight assistant. 
 USER: Hi. I am Daniel Martin.

ASSISTANT: Hello, how exactly I can serve you the best today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please, stay online. I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: Thank you for your valuable time. We are sorry to inform you that, no reservation was found on your name.

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

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