You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me to change the details in the past ticket? Because the meeting which is held at Austin is changed to New York city. So, I need to change the airport codes.

ASSISTANT: Sure, I will help you with that. May I know your name?

USER: Thank you for your response. My name is Mary Smith.

ASSISTANT: I successfully found your existing reservation. Can you please provide your changed source and destination airport codes?

USER: That's great, the source and destination airport codes are CLT and LGA.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Actually the travel dates are same, those are 11/24 and 11/26.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, I will wait for your response.

ASSISTANT: There is a flight with ticket fare 400 in Spirit airlines with a stopover. Is it ok for you?

USER: That's perfectly matching to my requirements, please go ahead with the ticket confirmation.

ASSISTANT: Your booking is confirmed with flight number 1023.

USER: Thanks a lot for your assistance and for your quick response.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: You are most welcome.