You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Could you please book me a ticket from IAH to DFW?

ASSISTANT: Sure, when you are willing to travel?

USER: I will start on May 20 and return on May 22.

ASSISTANT: May I know your connection limit?

USER: I need 1 lay by within my route.

ASSISTANT: Please mention your good name.

USER: I am Kathleen Parker.

ASSISTANT: Is there any other preferences?

USER: Yes, my depart time must me in the evening.

ASSISTANT: Sorry, there are no flight services available on your required dates.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for supporting us.