You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: My name is Ryan Carter and I want to change my existing reservation as there is an issue with my vacation plan.

ASSISTANT: Please wait for a moment while I check the status while reverting you.

USER: Sure.

ASSISTANT: Thanks for being patient, unfortunately we did not find any reservations on your name.

USER: OK, thanks for your response.

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