You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to book a flight from IAD to JFk?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travel dates are Mar 13th and 15th.

ASSISTANT: Do you have any specifications about class?

USER: No, I don't have. My name is Matthew Perez.

ASSISTANT: Do you have any preferences about flight connections?

USER: I am fine with a connecting flight.

ASSISTANT: There are no flights found under your preferable details.

USER: No problem, thank you for your help.

ASSISTANT: Welcome, have a great day.