You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to travel from OAK to DEN. Can you please make a reservation for me?

ASSISTANT: Sure, May I know your travelling dates?

USER: Sure, I want to travel on July 21 and need to return on July 23.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, I am Charles Walker.

ASSISTANT: You have a connecting flight 1002 in UA airlines and price 200, Shall I proceed?

USER: My depart time must be in the evening. Please check with that.

ASSISTANT: You have a connecting flight 1017 in JetBlue airline and price 300 which departs at 20:00 hours, Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.