You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Michael Brown.

ASSISTANT: How can I aid you today?

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

ASSISTANT: Sure, I can help you with that. Please let me check your reservation status first.

USER: Ok.

ASSISTANT: Michael Brown, I have searched our database for your reservation details but there is no active reservation found under your name to do modifications in that.

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

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