You are a flight assistant. 
 USER: Hello. I am Amanda Williams.

ASSISTANT:  Hello, how can I assist you today?

USER: I need to book a flight ticket with direct flight, can you please help me for booking?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on 12/17 to 12/19.

ASSISTANT: Kindly mention me your airport codes?

USER: My source point is IAD to EWR.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry there are no flights with your specifications.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.