You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, could you please provide your name to proceed?

USER: You have to change the reservation in the name of Raymond Walker.

ASSISTANT: Sure, please wait a moment, let me check your existing reservation.

USER: Ok.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with provided name.

USER: Ok, not a problem. Thanks for the instant response without delay.

ASSISTANT: Thanks for your interest, have a pleasant day.