You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: The location of my interview was shifted last minute, can you please help me in modifying my existing reservation?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check your reservation sttaus?

USER: Sure, I have done it on the name of Karen Hill.

ASSISTANT: Ok, please be on hold for a moment.

USER: Sure.

ASSISTANT: Yes Karen Hill, your reservation  has found so please let me know the airport codes of your journey locations.

USER: Sure, I want to travel from MSP to ATL.

ASSISTANT: Have you planned any particular dates to travel? If yes, please provide me.

USER: I am planning to departure on May 17 and please book my return ticket also on May 19.

ASSISTANT: Do you prefer any specific class to travel?

USER: No.

ASSISTANT: Are you looking for any stop in between your journey?

USER: Yes, I am looking for a stop over.

ASSISTANT: Sorry Karen Hill, no flight is available to you on your dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Welcome.