You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I am glad to solve your concern. Please provide me your name to check the reservation status on your name.

USER: I am Kevin Nelson.

ASSISTANT: Happy to inform you that, I got an active reservation on your name in our list. Please provide me your new planned travel dates.

USER: I prefer to travel on Apr 1 and Apr 3.

ASSISTANT: Ok, may I know your new airport codes?

USER: My airport codes are EWR and AUS.

ASSISTANT: Do you have connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Is there any other specifications to be met?

USER: I would like to return back in morning.

ASSISTANT:  I regret to inform you that I didn't find any flight in your route for your return journey due to inflation in polices of flight booking. Sorry for inconvenience caused  Kevin Nelson.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT:  Kevin Nelson, thank you for reaching us.