You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I help you?

USER: I am planning to attend a Seminer in IAD from ATL. Can you help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you. Please provide me your travel dates.

USER: Sure, my travelling dates are 05/01 and 05/03.

ASSISTANT: Ok, can I have your good name please?

USER: Yes, I am Larry Martinez.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights found with the dates you have given.

USER: Thank you for your valuable information.

ASSISTANT: You are welcome, thank you for reaching us.