You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: can you please help me in booking my flight ticket from IAD to EWR?

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are 07/22 and 07/24.

ASSISTANT: May I know your name please?

USER: Myself Jessica Johnson.

ASSISTANT: I am sorry no flights found on your journey dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you.