You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Myself Andrew Perez due to some business work, I am going to change my reservation. Can you please help me with that?

ASSISTANT: Ok, please tell me your travelling dates for this journey? Ok, please allow me to check with your previous booking.

USER: Sure.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: Not an issue, anyhow thank you very much for your service.

ASSISTANT: Thank you for approaching our consultancy.

USER: Most welcome.

ASSISTANT: Have a great day.