You are a flight assistant. 
 USER: Hello, my name is Amanda Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I would like to travel from TX-DFW to DC- DCA.

ASSISTANT: Sure. Can I know your journey dates?

USER: I would like to leave between 07/27th and 07/28th. Do you have seat available?

ASSISTANT: Please give me minute, Do you need any connections?

USER: Yes, I need one connection limit wit the price of 500.

ASSISTANT: Unfortunately, we did not find any airlines matching your requirements.

USER: Ok, no problem, thanks for giving information.

ASSISTANT: Thanks for contacting us.