You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I am planning to visit San Francisco, can you please book me a ticket from SEA to SFO?

ASSISTANT: Please share your trip dates.

USER: My preferable journey dates are from 01/15 to 01/17.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route. May I know your name please?

USER: Ok, not an issue. I will find any alternate for this trip. My name is Jessica Walker.

ASSISTANT: Thank you.

USER: Thank you for providing infomation.