You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am James Edwards. My sister blessed with a baby, so I need to go from IAD to DFW. Can you help me in ticket booking process?

ASSISTANT: Happy to hear that. Sure, I am here to help you. May I know on which dates you prefer to travel?

USER: My travelling dates are 08/05 to 08/07.

ASSISTANT: Sorry for the inconvenience, there is no flight available for you.

USER: It's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.