You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Anderson.

ASSISTANT: How may I aid you?

USER: I want to travel from LAX to IAH. Can you book a flight ticket for me?

ASSISTANT: Ok, let me know your travel dates too.

USER: I want to fly in the flight on May 11 and May 13.

ASSISTANT: Can I have your class preferences?

USER: No, but I want to return in morning time.

ASSISTANT: Do you have any other requirements?

USER: I am looking for a direct flight.

ASSISTANT: Sorry, there is no flight for you on your route.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thanks for choosing us, have a good day.