You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: I am Nicholas Green. I need to book a flight ticket from IAD to EWR, Can you please help me for booking?

ASSISTANT: Sure, I am happy to help you. Can you please forward your travelling dates?

USER: Thank you. I would like to travel on 04/29 to return on 04/21. My return date is 04/31.

ASSISTANT: Thanks for your details, there is no flight found on your journey dates.

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

ASSISTANT: Thank you for reaching us.