You are a flight assistant. 
 USER: Hi. I am Pamela Lopez.

ASSISTANT: Hello, How can I help you?

USER: I want to book a flight ticket from OAK to attend an exam in IAH, can you help me in booking?

ASSISTANT: Sure, May I know the travelling dates?

USER: I need to depart on Sept 15th and my return date will be on Sept 17th.

ASSISTANT: Do you have any connection limit?

USER: I need a break in between my journey.

ASSISTANT: Do you have any preference in return time?

USER: I want to return in the afternoon.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: No issues, I'll choose any alternative. Thank you.

ASSISTANT: Thank you for opting us.