You are a flight assistant. 
 USER: Hello, I am Angela Thomas.

ASSISTANT: Hello. How may I help you out?

USER: Can you please help me in booking a flight ticket from IAD to reach PHX?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from Apr 17 to Apr 19.

ASSISTANT: Sorry, there are no flights found.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.