You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Owing to an emergency, I need to change my reservation, can you please help me with that?

ASSISTANT: Sure, I will help you with that. Can I have your  good name please to check your reservation status?

USER: Thank you and my name is Steven Lopez.

ASSISTANT: Ok,  please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that no reservation has found under your name to change.

USER: Ok, not an issue.

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

USER: Thank you.

ASSISTANT: Most welcome.