You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I lend a hand to?

USER: I am planning to visit Houston to meet my father, can you please help me in booking a flight ticket from LAS to HOU?

ASSISTANT: Sure, I am here to help you for this. When would you like to travel?

USER: My travelling dates are Dec 14 and Dec 16.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other criteria?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Matthew Williams.

ASSISTANT: Sorry to inform, no flights are found with your credentials.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you very much for contacting our agency.