You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Dorothy Wilson.

ASSISTANT: Nice to meet you.

USER: I am planning to book a ticket from OAK to PHL. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am planning to travel on 04/26 and return back on 04/28.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: That's fine. Thank you for your service.

ASSISTANT: Thanks for reaching us, have a great day.