You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Ruth Wilson.

ASSISTANT: Thank you for providing your name.

USER: I want to change my existing reservation as my art gallery expo got postponed.

ASSISTANT: Ok.

USER: Will you help me in changing my reservation?

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Thank you for your valuable time. There is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us, have a great day.

USER: Thank you for prompt service.