You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to book a flight ticket which depart in the evening. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my travelling dates are Aug 16 and Aug 18.

ASSISTANT: Can you please share me your airport codes?

USER: Sure, I want o board from SFO to PHL.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there is no flight at this moment.

USER: No worries, thank you for the information.

ASSISTANT: Please share me your name.

USER: I am Jennifer Taylor.

ASSISTANT: Thank you Jennifer Taylor.