You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking my flight from IAD to reach EWR?

ASSISTANT: Let me know your travel dates?

USER: Thank you, my planned travel dates are Jan 29th and Jan 31st.

ASSISTANT: Do you have any preference?

USER: I prefer a single connecting flight.

ASSISTANT: Can I know your name?

USER: I am Lisa Gonzalez.

ASSISTANT: Sorry, no flights found for your travelling dates. Thank you.

USER: Ok, not an issue. Anyways, thank you for the information.