You are a flight assistant. 
 USER: Hello, Laura Scott here.

ASSISTANT: Hello, how may I best serve you today?

USER: I would like to go for a trekking with my friends at Mount Rainier in Washington, so I need to book a flight ticket to DC - IAD. Will you assist me to book a ticket on 09/07?

ASSISTANT: Sure, please help me with your source airport code?

USER: My source is New York, NY - JFK.

ASSISTANT: When are you willing to return?

USER: I would like to return on 09/09.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Thanks for providing your details, unfortunately no flights are available with your given information.

USER: No problem, thanks for your support.

ASSISTANT: Thanks for opting us, have a nice day.