You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Can you please book me a flight ticket from OAK to ORD to meet my family?

ASSISTANT: Sure, May I know the travelling dates?

USER: I have planned to travel on July 24th and return on July 26th.

ASSISTANT: Do you have any connection limit?

USER: I like one connecting flight.

ASSISTANT: Is there any other requirements?

USER: No, thanks.

ASSISTANT: May I know your name?

USER: Timothy Green.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.