You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please change my existing reservation, due to postpone of my meeting?

ASSISTANT: Sure, let me know your name to check your reservation details.

USER: My name is Kevin Baker.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: I am very sorry to inform you that there is no reservation found under your name in our database.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.