You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to proceed?

USER: Ok, my name is Andrew Martin.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We found a reservation on your name, kindly mention your new airport locations?

USER: My airport locations are BOS and MSP.

ASSISTANT: May I know when you are willing to travel?

USER: I need to travel on dates June 16 and June 18.

ASSISTANT: Are you looking for any preferred class?

USER: No, I am comfortable with any class.

ASSISTANT: Do you have any other specifications to be met?

USER:      I want to depart at evening.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for availing us.