You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: I am Eric Baker,Could you please help me in booking my flight ticket?

ASSISTANT: Sure, we are here to help you. May I know your source and destination?

USER: My airport codes are DC-IAD and GA-ATL.

ASSISTANT: May I know your journey dates?

USER: My depart date is Jan 4 and return date is Jan 6.

ASSISTANT: Please wait a moment, I will check it and get back to you.

USER: OK,I will be waiting.

ASSISTANT: There is no flight found on your given details. Thank you.

USER: Its OK,thank you.