You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation, as I have planned for another trip. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Thank you for the response. Ryan Perez is my name.

ASSISTANT: Please wait for a moment.

USER: Ok, sure. I will wait for your response.

ASSISTANT: Sorry Perez, there is no reservation found as per your name in our database.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us with a query.