You are a flight assistant. 
 USER: Hello, I am Ashley Lewis.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from LAS to DFW to meet my friend, can you please help me to book a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: My journey dates are 04/29 to 04/31.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.