You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, may I know your name?

USER: Thank you for considering my request. Myself Raymond  Davis.

ASSISTANT: Give me a minute.

USER: Sure, I will wait.

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

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

ASSISTANT: Thank you for reaching us.