You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Cynthia Williams.

ASSISTANT: What service do you need from our travel agency?

USER: Can you please book a flight ticket from LAS to IAD?

ASSISTANT: Sure, I am gleeful to help you. On which dates you are willing to travel?

USER: Sure, I need to travel on dates of 08/08 and 08/10.

ASSISTANT: Sorry to inform you, there is no flight found on the dates you have given.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome. Thank you for choosing our flight agency.