You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you at this moment?

USER: I need to book a flight ticket from DFW to IAD, Can you please help me for booking?

ASSISTANT: Sure, we are mirthful to help you. On which dates would you like to travel?

USER: I would like to travel on 06/11 to return on 06/13.

ASSISTANT: Please let me know if you need a connection in between your journey.

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences to be met?

USER: Yes, I need a normal cost airline.

ASSISTANT: To proceed further, can I know your name?

USER: Helen Scott here.

ASSISTANT: Please give me a minute to check the availability of flights.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your given preferences.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.