You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is John Martinez. I am looking to book a flight ticket with single connection. Can you help me to book a flight ticket from IAH to SEA?

ASSISTANT: Sure, I can do that for you. Can you please let me know your trip dates?

USER: My travelling dates are Aug 24 and Aug 26.

ASSISTANT: Ok, do you have any class preference?

USER: Any class is fine for me.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: May I know your departure and arrival times?

USER: My departure time is afternoon.

ASSISTANT: Ok, let me check.

USER: Ok.

ASSISTANT: Any other requirements do you have?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, let me check.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that there is no flight available as per your requirements.

USER: That's ok, thank you for checking.