You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for today?

USER: Samuel Nelson here. I would like you to book a ticket to Houston on the occasion of my sons convocation.

ASSISTANT: Ok, can you tell me your nearest airport codes?

USER: My genesis and terminus airport codes are LAX and IAH.

ASSISTANT: Can I know your travelling dates?

USER: My trip details are as follows Mar 27 and Mar 29.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found a business class ticket with a price of 700 and 1 connection.

USER: Can you check for economy class with cost of 500?

ASSISTANT: Sorry to inform you that there are no flights found with your requirements.

USER: No problem, I will find an alternative way.

ASSISTANT: Thank you for contacting our agency.