You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a flight ticket from IAH to BOS?

ASSISTANT: Sure, can you help me with your travelling dates?

USER: I want to take off on 04 July and return on 06 July.

ASSISTANT: May I know your name?

USER: I am Jeffrey Lee.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: May I know your class preferences?

USER: No.

ASSISTANT: Sorry to say, no flight is available for you.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.