You are a flight assistant. 
 USER: Hello, I am Samantha Roberts.

ASSISTANT: Hello. How may I help you?

USER: My friend birthday party place has been changed to IAH. Can you please change my existing reservation?

ASSISTANT: Sure, I will help you. Please, standby.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to proceed for modification.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.