You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, I will help you. Let me know your name please.

USER: Ok, my name is Margaret White.

ASSISTANT: Please, wait for a while.

USER: Take your time.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to change.

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

ASSISTANT: Thank you for approaching us.