You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I support you?

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

ASSISTANT: Sure, may I know your name to check in the reservation list?

USER: I am Dorothy Roberts.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thanks for holding on, we do not found any reservation with your name.

USER: Oh! may be booking not done properly.

ASSISTANT: Thanks for contacting us.

USER: Thanks for your support.