You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Myself Alexander Baker. Can you please book a flight ticket from PHL to SFO?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I need to travel on dates of 03/09 and 03/11.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure, take your time to check.

ASSISTANT: Sorry, there is no flights available on your requested route.

USER: Oh! It is sad to hear. Anyway, I will choose another agency this time.

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

USER: Thank you for your time.