You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have to change the destination airport code in the past ticket because I have given the wrong airport code. Can you please help me in changing the ticket details?

ASSISTANT: Sure, I can help you in ticket modification.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name for checking purpose?

USER: My name is Michael Williams.

ASSISTANT: Please wait for a while to check it.

USER: Ok, take your time and please tell me the ticket status.

ASSISTANT: Thank you for waiting, no reservation found for the user name in our data base when I have checked in our previous reservation list.

USER: How can you say that? I got a confirmation mail regarding my flight ticket booking and the amount has deducted from my account. Check it once again and provide the information?

ASSISTANT: Ok, I will check once again. Give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I have rechecked from higher authorities but I got the information that no flight ticket has reserved on the name that you have mentioned us for checking purpose and the amount will be deducted due to some technical issues. The deducted amount will be refund back to your account with in two days of time. Sorry for the inconvenience.

USER: Ok, thank you for providing the information. If the amount is not refunded to my account, what I have to do?

ASSISTANT: You can reach us at any time, we can help you in that one.

USER: Ok, thank you.

ASSISTANT: You are most welcome and thank you for reaching us.