You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can i aid you?

USER: I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, may I know your name to check your ticket from our database.

USER: Myself Nicole Parker.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We regret to inform you that there is no reservation found on your name.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for contacting us.