You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book flight ticket from PHL to LAX?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: My trip dates are Jan 10 and Jan 12.

ASSISTANT: Do you prefer either economy or business class?

USER: I prefer to travel in business class.

ASSISTANT: Do you have any specific airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I am ok with any timings.

ASSISTANT: May I know your name to proceed further with the booking?

USER: Susan King here.

ASSISTANT: Sorry, we don't have any seat left in business class to proceed.

USER: Can you please check with connecting flight.

ASSISTANT: We don't have any flight even with the connecting flight.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you.