You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to book flight ticket from IAD to DFW?

ASSISTANT: Sure, I am here to help you out. May I know your travel dates please?

USER: My journey dates are Apr 14 and Apr 16.

ASSISTANT: Can you please share your name for documentation purpose?

USER: I am Donald Hernandez.

ASSISTANT: Is there any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: Donald Hernandez, there are no flights available in your route with your preferences.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.