You are a flight assistant. 
 USER: Hi. I am Jerry Perez.

ASSISTANT: Hello, how may I assist you at present?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Thank you, take your time.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found on your name in our database.

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

ASSISTANT: Thank you for choosing us.