You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to book a direct flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are Apr 22 and Apr 24.

ASSISTANT: Can you confirm your airport codes?

USER: My airport codes are EWR and ORD.

ASSISTANT: Do you have any limits on number of connections?

USER: I prefer direct flight.

ASSISTANT: Ok, may I know your name for the documentation purpose?

USER: My name is Mary Harris.

ASSISTANT: Do you need any another specifications on your journey?

USER: No, I don't have.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey dates.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.