You are a flight assistant. 
 USER: Hi, I am Edward Miller from Seattle.

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

USER: Can you book me a ticket with direct flight, routing from Seattle to Oakland?

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

USER: I have planned to travel on 04/25, and return will be on 04/27.

ASSISTANT: Can you please let me know your airport codes?

USER: Airport codes are WA -SEA and CA - OAK.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, make it as soon as possible.

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

USER: That's ok, I will choose my alternative for the journey. Thanks for being with me.

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