You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to travel Seattle for my film shooting purpose, can you please help me in booking flight ticket?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: May I know your good name?

USER: Myself William Collins.

ASSISTANT: Can I know your travelling dates please?

USER: My departure dates is 09/24 and please book my return ticket also on 09/26.

ASSISTANT: Ok, please provide me your departure and arrival airport codes.

USER: I want to take off from SFO airport because it is near to my location and destination airport is SEA.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available on those dates that you want to travel.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you for reaching our services.