You are a flight assistant. 
 USER: Hello, I am Ryan Turner. I have a meeting with immigration officers on the dates of my planned journey.

ASSISTANT: Hello Turner, what can I do for you?

USER: Can you please help me with changing my existing reservation which I have done previously?

ASSISTANT: Sure Turner, I will help you in changing your previous reservation. Could you please wait for a few minutes.

USER: Sure.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

USER: That's fine. thank you for checking with my previous reservation.

ASSISTANT: Do you need any other help from my side?

USER: No, thank you for your quick response.

ASSISTANT: Thank you for reaching us, I hope you will approach us again.

USER: Sure.