You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me in booking flight ticket from IAD to LAS to attend an event.

ASSISTANT: It's my pleasure to help you. Sure, can you please let me know your trip dates?

USER: My trip dates are July 23 to July 25.

ASSISTANT: May I know, whether you are comfortable with connecting flight or direct flight?

USER: I prefer to travel in direct flight.

ASSISTANT: Are you interested to fly with economy class flight or business class flight?

USER: I am okay with any class.

ASSISTANT: May I know your preferred airline for your journey?

USER: I don't have any specific airline.

ASSISTANT: At the time of flight take off and for your return journey, do you have any specific time preference?

USER: No.

ASSISTANT: Could you please share me your name to proceed further?

USER: Sure, myself Samantha Baker.

ASSISTANT: Thank you for providing me all your required details. Please allow me 2-3 minutes while I check with the flights availability.

USER: Ok.

ASSISTANT: Thank you for waiting, Samantha Baker. Your patience is appreciated. Sorry, there is no flight available which match your needs for the mentioned dates.

USER: Ok, no problem. I will choose alternate way to reach my destination. Thank you for checking.

ASSISTANT: Thank you for reaching us! Have a great day!.