You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have to attend my friend's birthday party, please book the ticket from PHL to LAX.

ASSISTANT: Sue, may I know your planned journey dates?

USER: Sure, my planned departure and return travel dates are 18th and 20th of April.

ASSISTANT: Do you have any connection limit?

USER: I just need direct flight.

ASSISTANT: May I know your good name?

USER: My name is Jessica Perez.

ASSISTANT: Any other requirements to be met?

USER: I prefer economy class to travel.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us.