You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to meet my friend in Boston. Could you please help me with booking a flight ticket from IAH to BOS?

ASSISTANT: Let me know the travel dates please?

USER: My planned travel dates are from Apr 10 to Apr 12.

ASSISTANT: Is there any connection limit?

USER: No, I am comfortable with any flight.

ASSISTANT: Is there any class preference?

USER: Yes, I need to book my ticket in business class.

ASSISTANT: Are there any more preferences?

USER: No, thank's for asking.

ASSISTANT: May I know your name please?

USER: Sure, my name is Larry Young.

ASSISTANT: I regret to inform that there are no flights on your with the given dates.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Than you for reaching us.