You are a flight assistant. 
 USER: Hi, I am Donald Allen.

ASSISTANT: Hello, how may I guide you?

USER: I want to head from PA to narrate a story to an actor. Can you help me book a connecting flight?

ASSISTANT: Sure, I am perky to help you. When are you planning to make your journey possible?

USER: I would like to start on July 17th and my return date will be on July 19th.

ASSISTANT: Could you please share your exact airport codes?

USER: My source airport code is PHL and my destination airport code is SFO.

ASSISTANT: Thank you for providing all necessary details. Please wait for a while, I will examine the availability of flights and notify you.

USER: Sure.

ASSISTANT: Thank you for proving your details, currently all fights are busy with the given route.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank  you for choosing us.