You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me to book a flight ticket from IAH to SEA?

ASSISTANT: Sure, can you please mention with your dates of journey?

USER: My travel dates are Apr 30 and May 02.

ASSISTANT: May I know your name please?

USER: I am Stephen Young.

ASSISTANT: Do you have any other specifications please?

USER: I prefer connecting flight for this trip.

ASSISTANT: Sorry Stephen, there is no flight found as per your travelling details.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome.