You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to travel IAD from EWR, can you please help me with this?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are Apr 4 and Apr 6.

ASSISTANT: Do you have any specifications?

USER: I prefer a connecting flight.

ASSISTANT: Is there any class preferences?

USER: I am comfortable with any class.

ASSISTANT: May I know your good name?

USER: Richard Martinez here.

ASSISTANT: Sorry, no flights found on your given details.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.