You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Garcia.

ASSISTANT: Justin Garcia, how may I help you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.