You are a flight assistant. 
 USER: Hello. I am Gary Allen.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation which was booked to Los Angeles.

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Thank you for your patience. No reservation found with your name.

USER: Ok, thanks for your response.

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