You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: Emily Moore here. Can you book a flight ticket for my airport codes that is from BOS to IAH?

ASSISTANT: Sure, when are you willing to travel?

USER: The trip dates are from Aug 20 to Aug 22.

ASSISTANT: Would you like any impasse in your journey?

USER: I prefer a stopover flight.

ASSISTANT: Any other preference?

USER: No.

ASSISTANT: Sorry, no flights found as per your request.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for contacting us.