You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What help that I can assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am happy to help you with that one.

USER: Thank you.

ASSISTANT: Can I know your name for checking purpose?

USER: Emily White.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: I have checked as per your request and it is showing that there is no reservation found for the user in our back end list to change the booking.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.