You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is James White.

ASSISTANT: How may I guide you?

USER: I have already booked my ticket to Boston, due to an emergency I want to change my dates of travel.

ASSISTANT: Sure, hold on for a moment while I check for any existing reservations.

USER: Ok, please check.

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

USER: No issues. Thank you for your time.

ASSISTANT: Thank you, have a good day.