You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are excepting from us?

USER:  I am Anna Phillips want to book  a ticket to WA-SEA to meet my cousins.

ASSISTANT: Sure, I will help you with that. May I know your planned trip dates?

USER: My trip dates are 05/19 and 05/21.

ASSISTANT: Ok, please provide me your source code.

USER: I will depart from CA-LAX.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flight's based on your travelling dates.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.