You are a flight assistant. 
 USER: Hi, I am Debra Brown.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend a seminar which is held on 12/27, so please book me flight ticket from Houston.

ASSISTANT: Sure, help me with your travelling dates?

USER: Ok, I have planned to travel on 12/27 and return on 12/29.

ASSISTANT: Ok, let me know your airport codes?

USER: Sure, I would like to start from New York, NY-LGA to TX-HOU.

ASSISTANT: Ok, any connection limit?

USER: Yes, I need a connection in between.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

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

ASSISTANT: Thank you for choosing us.