You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Benjamin Miller here.

ASSISTANT: How can I  help you?

USER: I would like to attend a business seminar in Dallas, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure,may I know your airport codes please?

USER: I want to start my journey from AUS airport and I will prefer DFW as my destination airport.

ASSISTANT: On which dates you like to travel ?

USER: I am planning to leave my location on 05/07 and please book my return ticket also on 05/09.

ASSISTANT: There is AA airlines with double connection and  It cost you 200, can I  proceed for booking?

USER: Sorry, I need a single connecting flight. Please check for it.

ASSISTANT: I am sorry no single connection flights found on your route.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for choosing us.