You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation. Can you help me for that one?

ASSISTANT: Sure, may I know your name please?

USER: Sure, Joshua Allen here.

ASSISTANT: We found a reservation with your given name, please share your airport codes.

USER: Sure, My planned airport codes are PHX to IAH.

ASSISTANT: May I know your travelling dates?

USER: My planned travel dates are 02/05 and 02/07.

ASSISTANT: Let me know your connection limit.

USER: I want a flight with single connection.

ASSISTANT: Do you have any other requirements?

USER: No more, thank you.

ASSISTANT: We found a Southwest airline, flight number: 1018, price: 200 with one connection.

USER: Yes, you can proceed with that booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for the booking.

ASSISTANT: Thank you for choosing us.