You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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: Ok, may I know your name to check with availability?

USER: Thank you for considering my request. My name is Andrew Williams.

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

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

ASSISTANT: Andrew Williams, thank you for choosing our services.