You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Paul Garcia here. I'm planning to visit my uncle's home, can you book a ticket from OAK to IAH?

ASSISTANT: Sure, I will help you. Can you please help me with your journey dates?

USER: Sure, my planned departure and return travel dates are 19th and 21st of August.

ASSISTANT: Is there any class preference for you?

USER: Yes, I prefer economy class to travel.

ASSISTANT: Do you have any other specifications to meet?

USER: Yes, I want to depart on the afternoon in single connected flight.

ASSISTANT: Ok, please wait.

USER: Sure, take your own time.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

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

ASSISTANT: Thank you for choosing us.