You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I planned to surprise my parents on there wedding anniversary. Can you book me a flight ticket from Oakland?

ASSISTANT: Sure, May I know the journey codes?

USER: Sure, airport codes are from OAK to DFW.

ASSISTANT: Please help me with your travel dates.

USER: 06/17 and 06/19 are my travelling dates.

ASSISTANT: Can I get your name?

USER: Jacob Robinson is my name.

ASSISTANT: Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for opting our service.