You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Matthew Martinez here. I would like to visit Las Vegas, please help me in booking a ticket from DFW to LAS.

ASSISTANT: Sure, Can you please share your preferable journey dates?

USER: My journey dates are 04/16 and 04/18.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for contacting us.