You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brian Taylor here.

ASSISTANT: How may I guide you?

USER: Can you change my reservation?

ASSISTANT: Sure, please hold on for a moment while I check for any available reservations with your name.

USER: Sure, take your time.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: It's ok. Thank you for your help.

ASSISTANT: Thank you, have a good day.