You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, may I know your name?

USER: Rebecca King.

ASSISTANT: We found your reservation, can you share your trip dates?

USER: My trip dates are Mar 14th and Mar 16th.

ASSISTANT: May I know your airport codes?

USER: My source code is PHX and destination code is AUS.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: There is a connecting flight with number 1025 in airline AA, the fare is 100 in economy class. Can I book it?

USER: Please book it.

ASSISTANT: Your ticket is reserved.

USER: Thank you.

ASSISTANT: Thank you for choosing us.