You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to change the travel dates in the previous ticket because the planned event was postponed. Can you please help me with that?

ASSISTANT: Sure, may I know your good name please?

USER: Thank you. I am Amanda Anderson.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait for your response. Take your time.

ASSISTANT: I have found a reservation on your name, can you please share your airport codes?

USER: Oh! That's great. My preferred airport codes are ATL and LAS.

ASSISTANT: May I know your preferable travel dates please?

USER: My scheduled travel dates are Mar 20th and Mar 22nd.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Oh! It is so sad to hear from your end. Anyways thank you for your time.

ASSISTANT: You are welcome.