You are a flight assistant. 
 USER: Hello.

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

USER: Actually I am trying to modify the details in my previous ticket which is booked in the last week but due to some server problem I am not getting that. Can you please help me in changing?

ASSISTANT: Sure, I am happy to help with that. Can I have your good name to check your reservation status?

USER: Thanks a lot for responding quickly. My name is William Evans.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your own time. I will wait for your reply.

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

USER: That's great. My preferred airport codes are AUS and BOS.

ASSISTANT: Can I have your travel dates please?

USER: Ok, the planned travel dates are May 6 and May 8.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: No, I didn't have planned any particular timings for my journey.

ASSISTANT: Do you have any other specifications to get best flight for you?

USER: I prefer a single connecting flight to travel.

ASSISTANT: Sorry to inform you that no flight is available to you on your travelling  dates.

USER: It's ok, not an issue with that. Anyways thank you for your time.

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

USER: Most welcome.