You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Michael Perez. I am planning to attend music concert at IAD, can you please help me with booking a flight ticket from EWR?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Can you share me your trip dates?

USER: Sure, I would like to depart on Apr 22 and return on Apr 24.

ASSISTANT: What do you prefer either connecting flight or direct flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. Sorry to inform you that, there are no flights available with your given requirements.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us, we will try to serve you for the next time.

USER: You are welcome.