You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Kathleen Campbell. Can you please book a flight ticket from PHL to SFO?

ASSISTANT: Sure, May I know the travel dates?

USER: I am willing to travel from June 25 and return on June 27.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for availing us.