You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Phillips here.

ASSISTANT: How may I assist you now?

USER: I would like to do my research at Houston, please help me in booking a ticket from LAS to HOU.

ASSISTANT: Elizabeth Phillips, may I know your travelling dates?

USER: My planned travel dates are on Sept 27 and Sept 29.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I would like to depart in the afternoon and I need economy class for my trip.

ASSISTANT: Sorry, there is no flight available for your journey.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for connecting with our services, have a safe journey.