You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

USER: I am Andrew Walker. My friend birthday party place has been changed to Oakland. Can you please change my existing reservation?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: We didnt found any reservation by this name.

USER: No problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.