You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to some franchise meeting, I am willing to change my reservation. Can you please help me for this?

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

USER: Myself William Jackson.

ASSISTANT: Give me a minute, please.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your precious time, I have not found any reservation on your name to change.

USER: Ok, not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for availing us.