You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Myself Stephen Lee.

ASSISTANT: Yes Mr. Stephen, welcome to our agency.

USER: Thank you for welcoming me, there is a concern regarding the flight reservation. Can you aid me?

ASSISTANT: Sure, I am gleeful to help you. May I know your concern so I can provide you our best service in solving your request?

USER: Yes, I need your service in modifying my reservation because I have to change my destination airport code as the airport I want to go is been closed temperately. Can you amend the reservation?

ASSISTANT: Sure, I will aid you with the amendment of your reservation. Please be on hold.

USER: Thank you for the positive response. I will wait.

ASSISTANT: I really appreciate your patience. Sorry Lee as I had checked the reservation records, there is no reservation been found under your name in our records.

USER: That's so sad to know, anyway thank you for searching the reservation records for me.

ASSISTANT: You are welcome, thank you for approaching us. Have a great day.