You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have to meet my friend at Dallas, can you find a ticket for me from 11/06 to 11/08?

ASSISTANT: Sure. May I know the take off airport code?

USER: My take off airport code is DFW.

ASSISTANT: At first may I know your name please?

USER: My name is Anna Carter.

ASSISTANT: What was the destination airport code?

USER: My source and destination airport codes are IAH and DFW.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Anna, there are no flights found on your request. Do you have any other plans to travel?

USER: Ok, no problem, I will find any other mode of transport to travel.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us, have a nice day. You are welcome.