You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Edward Anderson here. I want to book a ticket from SFO to LAS to meet my friends.

ASSISTANT: Ok, please provide your preferable dates?

USER: My travel dates are 10/03 to 10/05.

ASSISTANT: Sorry, there are no flights available which matches with your preferences.

USER: It's ok, thank you for your information.

ASSISTANT: You are welcome.