You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Gonzalez.

ASSISTANT: How may I help you?

USER: I have to travel Oakland in the month of April, so I need a flight ticket from PHL to OAK. Can you please help me in flight ticket booking?

ASSISTANT: Sure, I will help you.

USER: Thank you so much.

ASSISTANT: Let me know your depart and arrival dates?

USER: Sure, my departure is on 27th and return back on 29th in April month.

ASSISTANT: Can I have your fare limit?

USER: Yes, my ticket budget is 1000.

ASSISTANT: Give me a minute, I will let you know the flight availability.

USER: Sure and on more request that I need a business class flight.

ASSISTANT: Thank you for your time, there were no flights available that matches your requirements.

USER: Ok, no problem with that one. Thank you for your immediate help.

ASSISTANT: Thank you for approaching us.

USER: Welcome.