You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book a ticket from IAD to DFW? As I have to attend a wedding.

ASSISTANT: Sure, please provide your travelling dates.

USER: Sure, my planned departure and return travel dates are 9th and 11th of August.

ASSISTANT: Ok, Do you have any class preference?

USER: I'm ok with any class.

ASSISTANT: Ok, Kindly mention your connection limit.

USER: I have much time, I don't have any connection preference.

ASSISTANT: Ok, please let me know your airline preference.

USER: I prefer normal-cost airlines.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, No flights were found with your given details.

USER: That's ok, thank you for giving the information.

ASSISTANT: Ok, May I know your name?

USER: Yes, my name is Brandon Williams.

ASSISTANT: Thank you for opting us.