You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to fly from DEN to OAK.Can you check the flight availability on that route?

ASSISTANT: Ok, may I know your travelling dates?

USER: My planned travel dates are 01/22 and 01/24.

ASSISTANT: May I know your connection limit?

USER: I want a flight with single connection.

ASSISTANT: Please mention your name.

USER: Sure,Donald Gonzalez here.

ASSISTANT: Please wait fr a moment.

USER: Make sure that, my return time should be in evening.

ASSISTANT: Donald Gonzalez, there is no flight reservation available by your name. Sorry, no flights are available.

USER: No issues, thank you for the checking.

ASSISTANT: Thank you for choosing us.