You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I have made a reservation in low cost airlines, but now I wish to travel with a major airlines, so please help me to modify my reservation.

ASSISTANT: Sure, we are here to help you to make some changes in your reservation.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name, to check with your recent reservation?

USER: Sure, you can check the reservation on the name of Mark Edwards.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok, I will wait.

ASSISTANT: Sorry to notify you that, we did not find any reservation in your name to make changes on your reservation.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.