You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I had a plan to have a trip this week so I had done reservation last week.But, due to some reasons I would like to change my reservation.

ASSISTANT: Sure, can I know the name used or doing your reservation?

USER: I have done reservation in the name of Linda Hernandez.

ASSISTANT: Your reservation found on your name, can you provide your new dates and codes of airport for which you want to make booking?

USER: My new dates are 02/14 and 02/16. And, my source airport is PA - PHL and destination airport is CA - SFO.

ASSISTANT: Please give me a moment, I will look for the availability.

USER: Ok.

ASSISTANT: Sorry Linda, there is no flights available on your given dates, do you want to cancel the reservation?

USER: It's ok I will go with another alternative. Thank you for the help.

ASSISTANT: Ok, thank you for reaching us.