You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Debra Taylor.

ASSISTANT: Sure, please share your travel dates.

USER: I would like to travel from PHL to SFO, could you help me out? My preferable dates are from 01/04 to 01/06.

ASSISTANT: Sorry, no flights available.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you, have a good day.