You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Carolyn Hill.

ASSISTANT: Yes, Hill.

USER: I am planning to visit a live music event in Washington, can you help me out to book a ticket from EWR to IAD?

ASSISTANT: That sounds good, can you share me your travelling dates?

USER: I would like to travel on 07/25 to 07/27.

ASSISTANT: Ok, please give me a moment let me check and revert you with the best flight in your route.Mean while mention me any other requirement you need from us.

USER: NO, I don't have any other requirement.

ASSISTANT: Sorry Hill, very sad to say you that there is no flights found on your request.

USER: That's really sad to hear. Thank you for your service.

ASSISTANT: Thank you for reaching us.