You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How ca I help you now?

USER: I am George Parker. Can you help me to book flight ticket to OAK from CLT?

ASSISTANT: Sure, provide me your travel dates.

USER: My planned dates are Feb 16 and Feb 18.

ASSISTANT: Do you have any connection limit?

USER: I need a stopover in between my journey.

ASSISTANT: May I know about your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other specifications?

USER: I prefer to return in the evening.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we have not found any flights running on your routes.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for contacting us.