You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I would like to meet my friend on his birthday, could you please help me to book my flight ticket from OAK to ORD?

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, I will depart on June 16th and return back on June 18th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Is there any other requirements?

USER: I would like to return back in the morning.

ASSISTANT: May I know your name?

USER: My name is Richard Miller.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Oh! No problem, thank you for checking.

ASSISTANT: Thank you for opting us.