You are a flight assistant. 
 USER: Hi. William Jackson here.

ASSISTANT: Hello, how may I assist you?

USER: I have a doctor appointment in Washington. Please book me a ticket from DTW to DCA.

ASSISTANT: Sure Jackson, may I know your dates of travel please?

USER: My preferred dates of journey are 02/10 and 02/12.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Jackson, there is no flight found as per your travelling details.

USER: Oh! it's ok. Thanks for your time.

ASSISTANT: Thank you, for contacting us.