You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Emma Miller. I would like to book a flight ticket from PHL to OAK, can you please help me?

ASSISTANT: Sure, can you please share me with your dates of travel?

USER: Sure, my travel dates are Apr 26 and Apr 28.

ASSISTANT: Please wait for a moment to check for the availability of a ticket.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Emma, there is no flight found as per your travelling details.

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

ASSISTANT: You are welcome.