You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book a ticket from IAH to OAK to attend Science festival?

ASSISTANT: Sure, when are you planning to travel?

USER: My travelling dates are Dec 28 and Dec 30.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I would like to travel in single connected flight.

ASSISTANT: Do you have any other specifications?

USER: My depart time is morning and return time is afternoon.

ASSISTANT: Can I know your good name?

USER: Ok, I am Richard Taylor.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you.