You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Phillips.

ASSISTANT: How can I aid you?

USER: I want to book a  flight ticket from WA-SEA to CA-SFO. Can you help me?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. May I know your planned travel dates?

USER: 08/07 and 08/09 are my travelling dates.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say, there are no flights available for your desired dates.

USER: No issue. Thank  you.

ASSISTANT: Thank you for reaching us.