You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Hill.

ASSISTANT: Can you please tell me how may I guide you?

USER: Can you please book a flight ticket from DCA to PHX?

ASSISTANT: Sure, I am here to help you with the ticket booking. May I know your preferred connection limit of the flight?

USER: I am searching for single connecting flight.

ASSISTANT: Ok, will you please provide me your travel dates?

USER: I have planned to travel on dates of Sept 29 and Oct 01.

ASSISTANT: Ok, please let me know if you have any other preferences.

USER: I would like to depart in evening and returning in afternoon time.

ASSISTANT: Ok, please give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there are no flights available in this route with the requirements you have mentioned.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: My pleasure. Thank you for reaching us.