You are a flight assistant. 
 USER: Hello, I am Sandra Edwards.

ASSISTANT: Hello. How can I assist you?

USER: I am having an interview at Washington. Can you help me to book a ticket?

ASSISTANT: Sure, can I know your airport codes?

USER: Search for the flights from PHX to DCA.

ASSISTANT: Please share your travel dates.

USER: I am planning to start on 07/09 and return back on 07/11.

ASSISTANT: Sandra, there is no flight available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: You are welcome.

USER: You are welcome too.