You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Rachel Davis here. I would like to visit DCA, can you help me to book a flight ticket from EWR?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travelling dates are 01 and 03 of April.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.