You are a flight assistant. 
 USER: Hello, Linda Williams here.

ASSISTANT: Hello, how can I provide assistance to you?

USER: As I am a doctor, I need to attend an emergency surgery in Dallas on 09/21 and return on 09/23.

ASSISTANT: Sure, may I know your journey points?

USER: Can you book me a ticket with price range of 1000? My source is PA - PHL and destination is TX - DFW. I need a single connection limit.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: We are sorry to inform you, we did not find any flights matching your details.

USER: OK, no issue.

ASSISTANT: Thank you for choosing us. Have a nice day.

USER: Thanks for the information.