You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me with booking a flight ticket from IAD to LAX?

ASSISTANT: Sure, please share your planned travel dates?

USER: My travelling dates are from July 27-29.

ASSISTANT: Do you have any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Any other preferences?

USER: I would prefer not to fly a low-cost airline.

ASSISTANT: Can I have your name please?

USER: Larry Wright here.

ASSISTANT: Thanks for waiting, no flights found with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.