You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I want to fly from IAH to DFW. Can you book a ticket from that route?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My planned travel dates are 04/23 and 04/25.

ASSISTANT: Ok, could I have your name please?

USER: Sure, Michelle Wright here.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I want a flight with single connection.

ASSISTANT: Ok, do you have any other specifications?

USER: Make sure that, my return time should be in the afternoon only.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No issues, thank you for the information.

ASSISTANT: You are welcome, have a great day.