You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand?

USER: I made a reservation earlier to attend a meeting in Houston but, due to some problems with clients meeting venue got changed to Los Angeles. So, I want you to please change my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: Raymond Thomas is my name.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: There was no reservation found on your name.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.