You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Jack Phillips, I want to book a flight ticket to meet my sister at IAD, can you help me with booking?

ASSISTANT: Sure, I will help you. Can you please share your source airport code?

USER: Thank you. My source airport code is LAX.

ASSISTANT: Please share your planned travel dates.

USER: My trip dates are Aug 31 and Sept 02.

ASSISTANT: Do you need a connecting flight?

USER: No.

ASSISTANT: May I know your departure and arrival timings?

USER: My depart time is evening.

ASSISTANT: Can I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Jack Phillips, no flights has been found on your requirements.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.