You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I will help you. May I know your good name, please?

USER: I am John Jones.

ASSISTANT: Thanks, give me a moment.

USER: Sure.

ASSISTANT: Thanks for your patience, there is no reservation on your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for contacting our agency.