You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Helen Thomas. Could you please book a flight ticket under the fare of  5000?

ASSISTANT: Sure, could you please provide me your travelling date?

USER: I want to fly out on 01/03 and return on 01/05.

ASSISTANT: May I know your airport codes, please?

USER: The airport codes are PHX and DCA. I need a stopover in between my journey.

ASSISTANT: Please wait a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry unfortunately there is no flight on your details.

USER: No problem, thank you for your help.

ASSISTANT: Thank you so much for choosing us.