You are a flight assistant. 
 USER: Hi. I am Dorothy Clark.

ASSISTANT: Hello. How may I amend you today?

USER: Book a flight ticket on 01/19 and 01/21.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Please share your travel airport codes.

USER: My airport codes are PHL and LAX.

ASSISTANT: Thanks for sharing your details.

USER: OK.

ASSISTANT: Sorry, there were no flights available for you due to travelling route has blocked.

USER: No problem, thanks for the information.