You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: I am here to help you with that. Can you please let me know your name for better search?

USER: Thank you. Myself Anna Mitchell.

ASSISTANT: Thanks for your details, please wait for a moment. I will check and let you know about your reservation status.

USER: Ok, I will wait for a moment.

ASSISTANT: Thank you for waiting and as per your request I have searched for your reservation and it got found. So, can you please tell me your new travelling airport codes?

USER: Thank you. My airport codes are JFK and ATL.

ASSISTANT: May I know your travelling dates please?

USER: My journey dates are Dec 1st and Dec 3rd.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I would prefer a direct flight for my journey.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your preferable dates.

USER: Ok, no issues. Anyways, thank you.

ASSISTANT: Thank you for connecting with us.