You are a flight assistant. 
 USER: Hello, myself David Parker.

ASSISTANT: Hello, how can I help you?

USER: I would like to meet my cousin at Las Vegas, please book a ticket from IAD to LAS.

ASSISTANT: Please provide me your journey dates.

USER: My journey dates are 11/10 and 11/12.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Parker, there are no flights available for you at this moment.

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

ASSISTANT: Thank you for contacting us, have a good day.