You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, your good name please?

USER: Myself Jacob Mitchell.

ASSISTANT: Thank you. How can I help you Jacob Mitchell?

USER: I need to book a flight ticket from ORD to IAD. Can you help me in my booking?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: On which dates you have planned to travel, please let me know.

USER: I will start my journey on July 18th and I will return on July 20th.

ASSISTANT: Ok, please wait a moment. I will get back to you with available flights.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are available on your desired routes.

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

ASSISTANT: Thanks for contacting us, have a great day.