You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to fly to Dc with the direct flight to treat an emergency case, could you please help me to book a flight ticket ?

ASSISTANT: Sure, I am gleeful to assist you.

USER: Thank you.

ASSISTANT: May I know your journey points?

USER: My boarding and landing airport codes are PHX and DCA.

ASSISTANT: When are you planning to travel?

USER: Sure, I intend to start 09/12 and my return date will be on 09/14.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No, please proceed.

ASSISTANT: Before checking with the airlines, may I know your name please?

USER: I am Benjamin Collins.

ASSISTANT: Thank you for providing all necessary details. Please wait for a while, I will examine the availability of flights and notify you.

USER: Sure.

ASSISTANT:   We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.