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 ticket from DFW to IAD?

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

USER: I planned my trip on the dates Oct 24 and Oct 26.

ASSISTANT: Do you have any preferences about flight connections?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No, other preferences. Please go ahead.

ASSISTANT: Please mention your name.

USER: Myself Samuel Edwards.

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

USER: No issue, anyway thank you for checking.

ASSISTANT: Welcome, have a great day.