You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from BOS to IAH. Can you please help me?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 07/18 to 07/20.

ASSISTANT: Do you have any other requirements?

USER: I want to book my ticket in economy class with 1 connection.

ASSISTANT: Do you prefer any depart any arrival time?

USER: Yes, I would prefer depart time in the afternoon.

ASSISTANT: Ok, can I know your name?

USER: Myself Larry Carter.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: My pleasure.