You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I would like to change my existing reservation. Can you help me in this?

ASSISTANT: May I know your name?

USER: Eric Lopez here.

ASSISTANT: Your reservation found, may I know your details?

USER: My airport codes are HOU - IAD.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My trip dates are 01/28 - 01/30.

ASSISTANT: Do you prefer any connections?

USER: I need a single connection.

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

USER: No.

ASSISTANT: AA airlines providing a connected flight in economy class.

USER: Please reserve my ticket in this airlines.

ASSISTANT: Your booking is done.

USER: Flight number please.

ASSISTANT: 1020 is your flight number.

USER: Thank you.

ASSISTANT: Thank you.