You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: Last week I have booked a ticket to attend a meeting at Houston, now I got a mail that the meeting is going to be held at Washington. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you. Can I have your full name for checking your previous reservation?

USER: Please, check the previous reservation details on Kathleen Thomas.

ASSISTANT: Ok, please be on hold, I will revert you.

USER: Ok, take your own time to check the details on my reservation.

ASSISTANT: Sorry Thomas, there is no reservation under your name to change your travel locations. Do you have any other quires?

USER: That's ok, no issue. If I have any queries, I will get back to you.

ASSISTANT: Ok, thank you very much for choosing our services. Have a nice day.