You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Jan 04 and Jan 06.

ASSISTANT: Do you need any connection limit?

USER: I need single connection flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer business class ticket.

ASSISTANT: May I know your name?

USER: Myself Samantha Thompson.

ASSISTANT:  Sorry, there are no flight tickets available on your journey dates.

USER: Thank you for checking.

ASSISTANT: Thank you for reaching our service.