You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight from DFW to BOS?

ASSISTANT:  Sure, may I know your preferable dates of journey?

USER: My travel dates are May 20 to 22.

ASSISTANT: Do you have any connection limit?

USER: I prefer direct flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: No.

ASSISTANT: Can I know your good name?

USER: I am Gary Lopez.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.