You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your travelling dates?

USER: My trip dates are Aug 23 and Aug 25.

ASSISTANT: May I know your name?

USER: I am Anna Lee.

ASSISTANT: Do you need any other specifications?

USER: I prefer connecting flight for this trip.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.