You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Could you book my ticket in a connecting flight?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I want to leave on Apr 26 and return on Apr 28.

ASSISTANT: Can you please share your airport codes?

USER: I want to travel from IAD to HOU.

ASSISTANT: Do you have any airline preferences?

USER: I had a bad experience in low-cost airlines, so please book my ticket in normal-cost airlines.

ASSISTANT: Would you like to travel in a connecting flight or direct flight?

USER: I already mentioned.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: May I know your good name please?

USER: My name is Catherine Perez.

ASSISTANT: Sorry, there is no flight available in this route.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.