You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Hall.

ASSISTANT: How can I assist you?

USER: I need to amend my reservation, can you help me out please?

ASSISTANT: Sure, please give me a minute.

USER: Sure.

ASSISTANT: Please provide me your new journey dates.

USER: My trip dates are from 01/21 till 01/23. Check the direct flight for me.

ASSISTANT: May I know your respective airport codes please?

USER: My location airport codes are from ORD to OAK.

ASSISTANT: There are no direct flights available at this moment.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a good day.