You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Richard Edwards.

ASSISTANT: How can I aid you?

USER: I am planning my trip to visit San Francisco to promote my business. Can you please help me in reserving the ticket from IAD to SFO?

ASSISTANT: Sure, I am here to help you. May I know on which dates you want to travel?

USER: I am planning my trip on Sept 26, and again I will return back on Sept 28.

ASSISTANT: Do you need any halt in between the journey?

USER: I am flexible with single connection.

ASSISTANT: Do you have any other specifications on your trip?

USER: My depart time is afternoon.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry we didn't find any flights with your details.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us, have a good day.

USER: You are most welcome.