You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, may I know how best I can help you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: Kathleen Garcia here.

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

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for reaching us.