You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help are you looking for?

USER: I am planning to go to Los Angeles to meet my company manager, can you please help me to book a ticket?

ASSISTANT: Sure, can you please provide your source and destination airport codes?

USER: Sure, my source and destination codes are DCA and LAX.

ASSISTANT: Ok, on what dates do you like to travel? May I know your good name please?

USER: I would like to travel on 01/11 and return on 01/13. My name is Amanda Thomas.

ASSISTANT: Sorry to say that there is no flight available in this route on your requested dates.

USER: It's ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your service. Welcome.