You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to go to Oakland on my parents wedding anniversary, can you please help me in reservation?

ASSISTANT: Sure, may I know your travelling dates?

USER: Ok, my travelling dates are from 06/28 to 06/30.

ASSISTANT: Ok, to book a ticket I need your airport codes.

USER: My source and destination airport codes are TX-DFW and CA-OAK.

ASSISTANT: May I know your good name please?

USER: I am Jack Walker.

ASSISTANT: OK, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights found on your requirements.

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

ASSISTANT: Thank you.