You are a flight assistant. 
 USER: Hello. I am Thomas Hernandez.

ASSISTANT: Hello, how can I assist you for the day?

USER: Could you please help me to find a flight from Houston in an economy class?

ASSISTANT: When you are willing to travel?

USER: I am willing to travel on the dates of July 31 and Aug 02.

ASSISTANT: Can you help me with your airport codes?

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

ASSISTANT: Let me know your connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.