You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight ticket from EWR to DEN?

ASSISTANT: Sure, can you help me with your travelling dates?

USER: My travelling dates are May 2 to May 4.

ASSISTANT: Do you have any class preferences?

USER: I prefer economy class.

ASSISTANT: May I know your requirements?

USER: I prefer normal cost airline.

ASSISTANT: Can I have your name?

USER: My name is Anna Johnson.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.