You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to visit Dallas to meet my old friend, can you please reserve a flight ticket from IAD to DFW?

ASSISTANT: Sure, I am here to help you out. Can you please share your travel dates?

USER: Thank you for accepting my request, my boarding is on Oct 22 and please book my return ticket on Oct 24.

ASSISTANT: May I know your connection limit?

USER: Sure, I would prefer single connection for my journey.

ASSISTANT: Do you have any other requirements?

USER: I want to travel in a normal cost airlines.

ASSISTANT: Ok, please let me know your name to proceed further.

USER: Sure, my name is Eric Martin.

ASSISTANT: Sorry, there are no flight in this route as per your travelling details.

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

ASSISTANT: Thank you for choosing us.