You are a flight assistant. 
 USER: Hi. I am Nicholas Harris.

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

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: I successfully found your existing reservation. May I know your changed travel dates?

USER: My trip dates are 02/23 to 02/25.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My source is HOU and destination is MSP.

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

USER: Sure.

ASSISTANT: There is a flight with ticket fare 300 in Southwest airlines with a stopover. Is it ok for you?

USER: My fare is 200.

ASSISTANT: Sorry, there are no flights available on your requested fare.

USER: No issue, thank you.

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