You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Virginia Collins, I would like to change my existing reservation, because while booking I gave wrong wrong airport codes in my previous reservation, so can you help me for this?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: I need to know your good name to search the previous reservation.

USER: Reservation is done on the name of Virginia Collins.

ASSISTANT: Ok, please give me a moment to check your previous reservation.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our database.

USER: Oh! it is ok, no problem. Thank you for your services.

ASSISTANT: Thank you for your positive response. Have a nice day.