You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Stephanie Thomas.

ASSISTANT: How may I assist you at this moment?

USER: Can you please search a flight ticket from LGA to IAH?

ASSISTANT: Sure, I am here to help you. Can you please share your travel dates?

USER: My travelling dates are Aug 25 and Aug 27.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: May I know your airline preference?

USER: No. I do not have any airline preference.

ASSISTANT: Which class do you prefer?

USER: I can travel in any class.

ASSISTANT: Do you have any specific departure and arrival time?

USER: I need my return ticket at evening time.

ASSISTANT: Ok, please be on hold.

USER: Ok, sure.

ASSISTANT: Sorry, there are no flight in this route as per your travelling details.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you for choosing us.