You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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, I am here to help you with that. Can you please tell me your name?

USER: Sure, my name is Frank Williams.

ASSISTANT: Please wait a moment, let me check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us, have a great day.