You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today/.

USER: I am Carol Williams, have to go for Dallas, DFW to participate in basketball final match. Will you reserve a seat on 12/16?

ASSISTANT: Sure, kindly mention your return date?

USER: Sure. I will return on 12/18.

ASSISTANT: Can you please provide me your airport code?

USER: I will start from Oakland, OAK.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Ok. Thank you for the information.

ASSISTANT: Thanks for reaching us, have a good day.