You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Roberts, planning to visit Philadelphia. Can you please book me a ticket from SFO to PHL?

ASSISTANT: Ok, may I know your travelling dates?

USER: My preferable journey dates are from 10/07 to 10/09.

ASSISTANT: Sorry, Nancy no flights found with your preferable dates?

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for reaching us.