You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from IAH to OAK?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Mar 07 to 09.

ASSISTANT: Do you have any connection limit?

USER: I prefer for connecting flight.

ASSISTANT: Are there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am David Davis.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.