You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation. Can you please help me with this?

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

USER: Sure, my name is Jessica Harris.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in my database.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.