You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Allen.

ASSISTANT: How can I help you today?

USER: Please book a ticket from IAH to DFW to go for shopping.

ASSISTANT: Sure, can you share me your travelling dates?

USER: My travelling dates are Aug 25 and Aug 27.

ASSISTANT: Can you have any connection limit?

USER: Yes, I want one connection.

ASSISTANT: Is there any time concern?

USER: Yes, my return time is afternoon.

ASSISTANT: Which class you prefer to travel?

USER: I am comfortable with any class.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.