You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to find a flight from Houston to Denver?

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

USER: Thank you. I am willing to travel on the dates of Mar 05 and Mar 07.

ASSISTANT: Please provide your airport codes.

USER: The source and destination airport codes are HOU and DEN.

ASSISTANT: Do you have any preferences about class?

USER: No but I am looking for a connecting flight.

ASSISTANT: Please mention your name.

USER: My name is Margaret Martinez.

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

USER: It's ok, not a problem with that. Thank you for the information.

ASSISTANT: Welcome, have a great day.