You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Dennis Johnson. I would like to visit Boston to meet my cousin, can you please help me to book a flight ticket from HOU to BOS?

ASSISTANT: Ok, please can I know your travel dates to book a ticket?

USER: Sure, my itinerary dates are June 29 and July 01.

ASSISTANT: Ok, please can I know the specification you want?

USER: My departing time is afternoon and return time is evening.

ASSISTANT: Sorry, there is no flight available at your planned location.

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

ASSISTANT: Thank you for connecting with our agency.