You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to book a ticket from IAD to PHX, can you please help me out?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned journey dates?

USER: I am travelling on these dates Nov 10th and 12th.

ASSISTANT: Do you have any other requirements?

USER: I need direct flight.

ASSISTANT: Can I have your good name?

USER: Cynthia Walker here.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.