You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from IAD to PHL, can you please help me with that?

ASSISTANT: Sure, I am happy to help you. Can you please let me know your travelling dates?

USER: The travel dates are from 02/14 to 02/16.

ASSISTANT: Do you prefer any break in between journey?

USER: I need break in my journey and I am comfortable with business class.

ASSISTANT: Can I have your good name?

USER: David Gonzalez here.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.