You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I am Christopher Hernandez. I am looking for a direct flight, could you please help me with booking a flight ticket?

ASSISTANT: May I know your travelling dates?

USER: I would like to take off on 09/29 and return on 10/01.

ASSISTANT: Help me with the travelling airport codes.

USER: My nearest source airport code is LGA and destination airport code is IAH.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.