You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Carter.

ASSISTANT: How can I serve you today?

USER: I want to travel from OAK to DEN. Can you help me to book a flight ticket?

ASSISTANT: Sure, let me know your travel dates please?

USER: I want to fly in the flight on Sept 01 and Sept 03.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: I want to return in morning time.

ASSISTANT: May I know your connection limit?

USER: I want to have a connection of 1.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thanks for contacting us.