You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Yesterday I have booked a ticket for Dallas, DFW but your agent misplaced my origin code from New York to Boston. So I need to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I will help you to change your reservation with correct airport code. May I know your name please?

USER: My name is Mary Martin.

ASSISTANT: Please wait for a moment, while I check for the reservation on your name.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, Sorry there is no reservation found on your name in our system data.

USER: Ok, no worries. Thanks for your kind response.

ASSISTANT: Thank you for reaching us.