You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I help you today?

USER: I want to change my destination airport code in my existing reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: For changing your reservation, we need to check your reservation status. So, please send the name on which it was reserved previously.

USER: Sure, my name is Michael Garcia.

ASSISTANT: Ok, please wait for a while. I will check with it and get back to you.

USER: Ok, take your time.

ASSISTANT: We are happy to inform you that, we have found an active reservation on your name. Please, share me your nearest airport codes.

USER: Sure, my airport codes are DTW and LAS.

ASSISTANT: Can I know your departure and arrival dates, please?

USER: Sure, my departure and arrival day are May 23 and May 25.

ASSISTANT: Do you have any connection limit for your journey?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: May I know about your other specifications, if any?

USER: No more specifications.

ASSISTANT: We regret to say that, we have not found any flights running on your routes.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.