You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to celebrate my father birthday. Can you check the flight availability on that root?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My planned travel dates are 10/28 and 10/30.

ASSISTANT: Can you please share your source and destination airport codes?

USER: My airport codes are HOU to ORD.

ASSISTANT: Do you have any class preference?

USER: I need business class with 0 connection limit. No more specifications please.

ASSISTANT: May I know your good name please?

USER: Helen Clark here.

ASSISTANT: Sorry, there is no flight available in this route.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for approaching us.