You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Sharon Hernandez, can you help me to book a flight ticket from DFW to DEN?

ASSISTANT: Sure, can you please share your travel dates?

USER: Yes, I need a flight ticket for the dates Aug 4th and Aug 6th respectively.

ASSISTANT: Do you have any class preference?

USER: No, please book for any class with is available as per my trip.

ASSISTANT: Sharon Hernandez, I am sorry to inform you that there is no flight available at your request.

USER: That is ok, thank you for choosing our agency.

ASSISTANT: You are welcome. Thank you for contacting us.