You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I have planned to go for a holiday trip but it got postponed as of now due to bad weather, so could you please help me with changing my reservation?

ASSISTANT: Sure, please provide me your name?

USER: Reservation was made by Lisa Collins.

ASSISTANT:  We found reservation on your name, may I know your new travel dates?

USER: Sure, I will start on 12/24 and return back on 12/26.

ASSISTANT: Help me with your travel points?

USER: My airport codes are from DTW to OAK.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your travel dates.

USER: Ok, no issues. Thank you for your time.

ASSISTANT:  Thank you for availing us.