You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me to change the details in the past ticket? Because the meeting which is held at Austin is changed to New York city. So, I need to change the airport codes.

ASSISTANT: Sure, I am glad to help you in changing your reservation.

USER: Thank you for accepting my request.

ASSISTANT: To check the reservation status with your name please provide the name.

USER: My name is Gary Harris.

ASSISTANT: Ok, please wait for sometime to check in our database.

USER: I will wait for your response. Take your time.

ASSISTANT: I regret to say this Gary that there is no active reservations with your name to change in our database.

USER: It's ok, thank you for checking the ticket status.

ASSISTANT: You are most welcome, thank you for reaching our service. Hope you have a nice day ahead.

USER: You are welcome.