You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am William Garcia.

ASSISTANT: Nice to meet you William.

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: I found your flight reservation. Please tell me your airport codes?

USER: My source and destination airport codes are DTW and LAX.

ASSISTANT: Your travel dates please?

USER: I want to fly on Apr 18, return on Apr 20.

ASSISTANT: Please wait.

USER: Sure, I need a connecting flight.

ASSISTANT: Thanks for your patience. I have found spirit airlines which flies with one connection.

USER: You can proceed to booking.

ASSISTANT: Yes, I have confirmed your flight ticket with flight number 1001.

USER: Thank you for your help.

ASSISTANT: Thank you.