You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking a flight ticket from HOU to DEN?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my travel dates are from Apr 28 to Apr 30.

ASSISTANT: Do you have any preference?

USER: I would prefer connecting flight for my trip.

ASSISTANT: Can I know your name?

USER: Myself Carol Thompson.

ASSISTANT: Sorry, no flights found for your travelling dates. Thank you.

USER: Ok, no issues. Thank you for the information.