You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Ronald Martinez.

ASSISTANT: How can I assist you today?

USER: Can you please book a flight ticket from LAX to IAD?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, I need to travel on dates of 06/25 and 06/27.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no flights available.

USER: It's ok fine, no problem. Anyway, thank you for your time.

ASSISTANT: Thanks for reaching us, have a great day.