You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I have a plan to visit Cockrell Butterfly Center located in Houston. Can you help me in booking flight ticket?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My trip dates are Sept 03 to 05.

ASSISTANT: Ok, may I know your name?

USER: Myself Robert Davis.

ASSISTANT: Ok, please provide me your travelling airport codes to search a flight for you.

USER: My airport codes are LGA to HOU.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: My depart should be in the evening.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.