You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Angela Lewis.

ASSISTANT: How may I help you?

USER: I want to go to San Francisco next week for my film shooting purpose, can you please book a flight ticket for me?

ASSISTANT: Lewis, I am here to help you. Could you please share me your source airport code and destination airport code?

USER: I planed to start from JFK to SFO.

ASSISTANT: When would you like to travel?

USER: My trip dates are 08/09 to 08/11.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: Lewis, sorry to inform that no flights are available on your prefer dates.

USER: No issue, thank you.

ASSISTANT: You are most welcome.