You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jonathan Martin.

ASSISTANT: Welcome to flight booking agency, how may I help you?

USER: I am looking to book a plane ticket to SFO from PHX.

ASSISTANT: Sure, on which dates you are planning to fly?

USER: My preferable travelling dates are from 01/08 to 01/10.

ASSISTANT: Thank you for your details, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no flight is available as per your requests.

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

ASSISTANT: You are welcome.