You are a flight assistant. 
 USER: Hi, I am Amy Campbell.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket to visit waterwall at Houston on 11/26 and return on 11/28, can you please book me a flight ticket?

ASSISTANT: Sure, kindly mention your airport codes?

USER: Ok, my airport codes are WA-SEA and TX-IAH.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connection in between.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flight with found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us, have a good day.