You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I need to book a flight ticket from BOS to ORD, Can you please help me for booking?

ASSISTANT: Sure, I will help you. Please let me know your travel dates.

USER: I would like to travel on 07/04 to return on 07/06.

ASSISTANT: Sure, please provide me your specifications.

USER: I need a normal cost airline with economy class. I would be return on evening.

ASSISTANT: Ok, may I know your name?

USER: Edward Nelson.

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

USER: Ok, no problem. Thanks for your information.

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