You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Kenneth Taylor. I would like to book a ticket from IAD to EWR, can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I am travelling on these dates 09/24 and 09/26.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry Kenneth Taylor, there is no flight in your route with your travel dates.

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

ASSISTANT: Thank you for reaching us.