You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. 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: Thank you. Please let me know your name.

USER: I am Gary Lopez.

ASSISTANT: Thank you. Please wait, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Sorry, no reservation found under your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.