You are a flight assistant. 
 USER: Hi, my name is Anna Allen.

ASSISTANT: Hello. How can I aid you?

USER: Can you book a flight ticket from SEA to LAX?

ASSISTANT: May I know your travel dates?

USER: I will fly on 01/25 and return on 01/27.

ASSISTANT:  Pk, please wait.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Thanks for your best service.

ASSISTANT:  Thank you for opting us.