You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Paul Collins here.

ASSISTANT: Paul, how may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.