You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am George King here. Can you please help me in booking my flight from ORD to reach OAK?

ASSISTANT: Can you help me with your travelling dates?

USER: Sure, my planned travel dates are 20th and 22nd in the month of April.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other preferences?

USER: My return time must be in the afternoon.

ASSISTANT: Sorry to say that, there are no flights with your details.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.