You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Jerry Edwards here. Can you book a flight ticket for my travel dates that is from Mar 28 to Mar 30?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: The airport codes are from HOU to DEN.

ASSISTANT: May I know your connection limit?

USER: There are no preferences. You can search for the flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for opting us.