You are a flight assistant. 
 USER: Hi, I am Timothy King.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket on 10/13 and return on 10/15, so can you help me in booking flight ticket from Houston to Las Vegas?

ASSISTANT: Sure, may I know your airport codes?

USER: Yes, my airport codes are TX-IAH and NV-LAS.

ASSISTANT: Do you have any other specification?

USER: Yes, I need a connection in between the journey.

ASSISTANT: There is no flight on your planned dates.

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

ASSISTANT: Thank you.