You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, can I know your name please?

USER: Thank you for considering my request. My name is Brandon Robinson.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I will wait for  your response.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not an issue. thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.