You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Anthony Phillips.

ASSISTANT: How may I assist you?

USER: Due to change in the venue of the event, I would like to change my existing reservation. Can you please help me?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Anthony, no reservation has been found on your name in our records.

USER: I guess something went wrong while booking the ticket. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.