You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: As I have done a reservation accidentally last week with wrong airports but I have lot of ways to change my reservation but for a last try with your service. Can you please help in modification of my reservation?

ASSISTANT: Sure, do let me know your name please?

USER: Sure, my name is Alexander Jones.

ASSISTANT: Sorry, no reservation found with your name in our agency portals.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you for contacting us.