You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Due to health issues, I need to change my recent reservation. Please help me with that.

ASSISTANT: Sure, can I know your name please?

USER: I am Christopher Rodriguez.

ASSISTANT: I found your reservation, can you please provide the travel dates?

USER: My travel dates are from Aug, 31 to Sept, 02.

ASSISTANT: Can I know the airport codes please?

USER: My source airport code is LGA and destination airport code is IAD.

ASSISTANT: Do you have any requirements?

USER: I need to depart in the evening and I prefer a single connecting flight.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: There is a connecting flight in American airlines, can I book it?

USER: Please proceed.

ASSISTANT: Your reservation has been changed and flight number is 1025.

USER: Thank you for booking.

ASSISTANT: Thank you for approaching us.