You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I would like to change my destination airport code, please help me in changing my existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name to check your reservation status?

USER: My name is Brian White.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: We have found an active reservation on your name. Please, share me your nearest airport codes.

USER: My airport codes are BOS and ORD.

ASSISTANT: May I know your travelling dates, please?

USER: My travel dates are on Apr 26 and Apr 28.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Let me know your other specifications for your journey.

USER: I would like to return in the afternoon.

ASSISTANT: We regret to inform you that, we have not found any flights running on your desired dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.