You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Jeffrey Parker. I am planning to travel from DCA to EWR, can you help in booking a flight for me?

ASSISTANT: Sure, please provide me your travel dates.

USER: My travelling dates are 03/05 to 03/07.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

USER: That's ok. Thank you for your help.

ASSISTANT: My pleasure.