You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald Collins.

ASSISTANT: How can I assist you today?

USER: Due to an emergency I need a flight ticket to travel to Oakland to do some surgery, so can you please help me in flight ticket booking from OAK to OAK?

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

USER: Sure, my travelling dates that I have planned is on 07/04 and back on 07/06.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

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

USER: Ok, I can reach another travelling agency to book the ticket. Thank you for your help.

ASSISTANT: Welcome, have a great day.

USER: Welcome.