You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: May I know your name?

USER: Sure, my name is Michelle Martin.

ASSISTANT: Ok. Change reservation found.

USER: Ok, my planned dates of journey are from Mar, 23 to Mar, 25.

ASSISTANT: May I know your airport codes?

USER: My respective airport codes are from LAX to IAD.

ASSISTANT: Is there any preference?

USER: Yes, I want to fly in a connecting flight.

ASSISTANT: Found flight with Southwest airlines for price 900 having flight number 1005. Shall I book a ticket?

USER: Ok, you can book it.

ASSISTANT: Your ticket is booked. Thank you.