You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking my flight ticket from ORD to IAD?

ASSISTANT: Sure, I can do that for you. Can I know your name?

USER: I am Brenda Thompson.

ASSISTANT: Thank you. Could you please help me with your travel dates?

USER: My planned travel dates are April 27-29.

ASSISTANT: Ok, please provide us your class preference.

USER: I do not have any class but, I want to return in the afternoon.

ASSISTANT: Ok, please stay online for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome and thank you for approaching us.