You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Oakland OAK from Dallas DFW.  Can you make a reservation for me?

ASSISTANT: Let me know your travelling dates.

USER: Ok, my planned trip dates are on Jan 27 and return on Jan 29.

ASSISTANT: Do you have any preference?

USER: Yes, I want to return in the afternoon time.

ASSISTANT: Let me know your name.

USER: Yes, I am Pamela Baker.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for your information.