You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to meet my friend at Oakland, will you help me in booking the ticket?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travel dates are 06/22 and 06/24.

ASSISTANT: Ok, please mention your travelling airport codes?

USER: My source airport code is DFW and destination airport code is OAK.

ASSISTANT: Sorry, no flights found. May I know your name?

USER: Ok, not an issue. Myself Justin Brown.

ASSISTANT: Ok, fine thank you for reaching us.

USER: Thank you for helping me.