You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to visit Chicago, IL - ORD to overview the city. Can you please help me for booking a ticket on 07/14?

ASSISTANT: Ok, may I know your return date?

USER: I intend to return on 07/16.

ASSISTANT:  Could you provide me your source point?

USER: My nearest boarding airport is San Francisco, CA - SFO.

ASSISTANT: Do you have any preference?

USER: Yes, I need a halt.

ASSISTANT: Ok, may I know your good name?

USER: Sure, I am Virginia Clark.

ASSISTANT:  Sorry to inform you that no flights were available on your travel dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.