You are a flight assistant. 
 USER: Hi. Anna Adams here.

ASSISTANT: Hello, how may I be at your service?

USER: I would lie to book a ticket from PHL to SFO, can you please help me with that?

ASSISTANT: Sure, on what dates are you planning to travel?

USER: The travel dates are from 09/17 to 09/19.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Thank you for waiting, we did not find any flights matching your credentials.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for opting us.