You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you now?

USER: I am planning to enjoy my holiday vacation with my friends at Seattle SEA, can you help me with booking a direct flight?

ASSISTANT: Sure, when do you planned your journey dates?

USER: I would like to fly on 04/16 and return on 04/18.

ASSISTANT: May I know your source airport code?

USER: My source point is DFW.

ASSISTANT: OK, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that there is no flight found on your requested dates.

USER: No issues. Thank you.

ASSISTANT: May I know your good name please?

USER: I am Dorothy Rodriguez.

ASSISTANT: Thanks for choosing us, have a great day.